16. There was so much noise produced by the machine outside that the professor had to ______ his voice so that it would not ________.
| A．rise; be drowned | B．lift; drown | C．increase; drown | D．raise; be drowned |
----When did the concert?
---Well, two or three years ago?
| A．happen | B．take place | C．hold | D．start |
He offered to her a hand as the suitcase was too heavy for her to carry.
| A．hold | B．show | C．lend | D．borrow |
Tom,yourself. Did you forget the school rules?
| A．behave | B．believe | C．perform | D．conduct |
-- Not getting that job was a big bet down.
---Don’t worry. Something better will .
A. come along B. take on C. go by C. fall behind
The boy was made to the explanation(解释，说明 process of explaining) .
| A．speak | B．tell | C．repeat | D．say |