1．If city noises ________________ (not keep) from increasing, people ________________ (have to) shout to be heard even at the dinner table 20 years from now.
答案：are not kept, will have to
2．I ________________ (give) ten minutes to decide whether I should reject the offer.
答案：was given
3．The nice food ________ (serve) by the restaurant.
答案：is served
4．I need one more stamp before my collection ________ (complete)．
答案：is completed
5．The Chinese Spring Festival ________ (celebrate) in capitals all round Europe.
答案：is celebrated
6．Nobody but Jane ________ (know) the secret.
答案：knows
