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20.----I knocked over my tea cup.It went right over _______ keyboard.
----You shouldn’t put drinks near _________ computer.
A. the, / B. the, a C. a, / D. a, a
21.----Mr Johnson asked me to remind you of the meeting this afternoon.Don’t forget it!
----OK, I _________.
A. won’t B. don’t C. will D. do
22.It was a great day but we did not enjoy it _________ the beginning.
A. on B. for C. with D. at
23.----Millie, could you give me some advice? I don’t know _________.
----Why don’t you wear this red shirt?
A. when to wear B. what to wear C. how to wear D. where to wear