_________(48)
A.up
B.towards
C.on
D.down

_________(50)
A.flames
B.food
C.fires
D.furnaces

teacher/suggest/students/ write/ composition/pets/.
A.The teacher suggested that her students write a composition about pets.
B.The teacher suggested that her students to write a composition about pets.
C.The teacher suggested that her students wrote some compositions about pets.
D.The teacher suggested that her students had written a composition about pets.

About 200 million years before all the continents were part of one vast land mass called Pangea.
A.million
B.before
C.part
D.one vast land mass

The keyboard with alphabet keys is enough easy to use to give program instructions to the computer.
A.alphabet
B.enough easy
C.to use
D.program

Octopuses have not only large brains and also a well-developed nervous system.
A.Octopuses
B.large brains
C.and
D.well-developed

There is no excuse for your discourtesy. Think twice before you are going to say anything.
A.bravery
B.impoliteness
C.politeness
D.boldness

In spite of her embarrassment before Rodya’s urgent and challenging look, she could not deny herself that satisfaction.
A.demanding
B.hard
C.difficult
D.curious

Advanced students need to be aware of the importance of collocation.
A.of high level
B.of great improvement
C.of high position
D.of great progress

What was Levi Strauss ’job?
A.He was a clothes designer.
B.He was a prospector.
C.He was selling textiles and clothing.
D.He was selling tools for gold mining.