Chọn phương án đúng (ứng với A hoặc B, C, D) để hoàn thành mỗi câu sau.
______ entering the hall, he found everyone waiting for him.
A.With
B.On
C.At
D.During

Chọn phương án đúng (ứng với A hoặc B, C, D) để hoàn thành mỗi câu sau.
- “Has an announcement been made about the eight o’clock flight to Paris?” - “ _______.”
A.Not yet
B.Yes, it was
C.I don’t think that
D.Sorry, I don’t

Exploration of the Solar System is continuing, and at the present rate of progress all the planets will have been contacted within the near 50 years.
A.continuing
B.progress
C.within
D.near

__________(28)
A.extremes
B.poles
C.tops
D.heights

__________(30)
A.dunes
B.piles
C.valleys
D.stores

__________(31)
A.inconsistent
B.incapable
C.inexperienced
D.independent

__________(33)
A.danger
B.dangerous
C.endanger
D.endangered

__________(35)
A.sight
B.lies
C.sites
D.seats

The author refers to the ocean bottom as a “frontier” in line 2 because it
A.is not a popular area for scientific research
B.contains a wide variety of life forms
C.attracts courageous explorers
D.is an unknown territory

The word “inaccessible” in line 3 is closest in meaning to
A.unrecognizable
B.unreachable
C.unusable
D.unsafe