18.My sister plenty of volunteer work in the past seven years.( )
| A. | doea | B. | is doing | C. | has done | D. | had done |
17.In order to finish the task in time,John kept for four hours without rest.( )
| A. | work | B. | to work | C. | works | D. | working |
16.Let's have a discussion about whether it is to talk on the phone while driving.( )
| A. | safe | B. | save | C. | safety | D. | safely |
15.The book is useful because it gives us advice on how to improve memory.( )
| A. | few | B. | little | C. | many | D. | much |
13. all the students are here.why don't we start our class meeting right now?( )
| A. | Although | B. | When | C. | Since | D. | Before' |
12. useful robot it is!It can help with the housework like a human servant.( )
| A. | What | B. | What a | C. | What an | D. | How |
11.-Can you tell me your online shopping will arrive?
-In three days,I think.( )
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-In three days,I think.( )
| A. | how fast | B. | how long | C. | how often | D. | how soon |