IV. Find the one mistake (A, B, C or D) in these sentences.
What (A) do you need your own computer for (B)? You can use (C) us (D).
A.What
B.for
C.can use
D.us

V. Read the following passage carefully, and then select the best option A, B, C or D to complete it.
Approximately one-third of the Arctic Ocean is underlain by continental shelf, which includes a broad shelf north of Eurasia and the narrower shelves of North America and Greenland. Seaward of the continental shelves lies the Arctic Basin proper, which is subdivided (26) _______ a set of three parallel ridges and four basins (also known as deeps). These features were discovered and explored (27) _______ in the late 1940s. The Lomonosov Ridge, the major ridge, cuts the Arctic Basin (28) _______ in half, extending as a submarine bridge 1,800 km (1,100 mi) from Siberia to the northwestern tip of Greenland. Parallel to it are two shorter ridges: the Alpha Ridge on the North American side, defining the Canada and Makarov basins, (29) _______ the Arctic Mid-Ocean Ridge on the Eurasian side, defining the Nansen and Amundsen basins. The average depth of the Arctic Ocean is only 1,300 m (4,300 ft) because of the vast shallow expanses on the continental shelves. The deepest (30) _______ in the Arctic Ocean is 5,450 m (17,880 ft).
(26)
A.on
B.in
C.into
D.onto

V. Read the following passage carefully, and then select the best option A, B, C or D to complete it.
Approximately one-third of the Arctic Ocean is underlain by continental shelf, which includes a broad shelf north of Eurasia and the narrower shelves of North America and Greenland. Seaward of the continental shelves lies the Arctic Basin proper, which is subdivided (26) _______ a set of three parallel ridges and four basins (also known as deeps). These features were discovered and explored (27) _______ in the late 1940s. The Lomonosov Ridge, the major ridge, cuts the Arctic Basin (28) _______ in half, extending as a submarine bridge 1,800 km (1,100 mi) from Siberia to the northwestern tip of Greenland. Parallel to it are two shorter ridges: the Alpha Ridge on the North American side, defining the Canada and Makarov basins, (29) _______ the Arctic Mid-Ocean Ridge on the Eurasian side, defining the Nansen and Amundsen basins. The average depth of the Arctic Ocean is only 1,300 m (4,300 ft) because of the vast shallow expanses on the continental shelves. The deepest (30) _______ in the Arctic Ocean is 5,450 m (17,880 ft).
(28)
A.most
B.mostly
C.all
D.almost

V. Read the following passage carefully, and then select the best option A, B, C or D to complete it.
Approximately one-third of the Arctic Ocean is underlain by continental shelf, which includes a broad shelf north of Eurasia and the narrower shelves of North America and Greenland. Seaward of the continental shelves lies the Arctic Basin proper, which is subdivided (26) _______ a set of three parallel ridges and four basins (also known as deeps). These features were discovered and explored (27) _______ in the late 1940s. The Lomonosov Ridge, the major ridge, cuts the Arctic Basin (28) _______ in half, extending as a submarine bridge 1,800 km (1,100 mi) from Siberia to the northwestern tip of Greenland. Parallel to it are two shorter ridges: the Alpha Ridge on the North American side, defining the Canada and Makarov basins, (29) _______ the Arctic Mid-Ocean Ridge on the Eurasian side, defining the Nansen and Amundsen basins. The average depth of the Arctic Ocean is only 1,300 m (4,300 ft) because of the vast shallow expanses on the continental shelves. The deepest (30) _______ in the Arctic Ocean is 5,450 m (17,880 ft).
(29)
A.and
B.but
C.or
D.so

I. Choose the word that has the underlined (letters) pronounced differ­ently from the others.

A.near
B.hear
C.ear
D.meat

(7)..........
A.could
B.should
C.would
D.might

A.submarine
B.destruction
C.variety
D.erosion

We had an accidental meeting with an old friend at the party last night.
A.unpleasant
B.unexpected
C.unlucky
D.unacceptable

Seventy-five percent of the earth’s _________are covered by sea and oceans.
A.face
B.flat
C.resurface
D.surface

Oil spills are a great _________to the undersea world.
A.threat
B.threaten
C.threatened
D.threateningly