Seeing his father’s angry expression on his face, Andy _______ the conversation from one subject to another.
| A．switched | B．concluded |
| C．announced | D．rejected |
Reagan was elected ___ of the United States in 1981.
| A．a president | B．president | C．the president | D．as president |
This is the best film __ we have seen this year.
| A．which | B．that | C．in which | D．for that |
He has a poor memory.He has forgotten ___ his dictionary while reading.
| A．carrying | B．taking | C．bringing | D．to bring |
They devote themselves to __ a new way to make populated water clean.
| A．finding | B．look for | C．find | D．having found |
Bamboo is ___ grass, but not tree.
| A．a type of | B．a pile of | C．a kind of | D．a piece of |