I think natural beauty ___ the best.

A. was
B. is
C. were
D. be

What ___ when I saw you yesterday?

A. did you do
B. were you doing
C. you were doing
D. you did

The students ___ an English class from 8 to 10 yesterday morning.

A. were having
B. had
C. would have
D. have

By the end of last term we ___ English for two years.

A. have studied
B. have been studied
C. would studied
D. had studied

Lily ___ in the dormitory for several years before she could rent a flat herself.

A. lived
B. had lived
C. has lived
D. will live

Wang Ming ___ English since he went to middle school.

A. learns
B. has been learning
C. has learnt
D. is learning

When mother came in, the twins ___ a talk.

A. were having
B. have had
C. had have
D. had

I won't go to bed until I ___ the job.

A. have done
B. had done
C. will do
D. do

1.Now the pollution caused by the increasing number of cars __________more and more serious in many cities. （2014-12）a. becomeb. is becoming c. becamed. had become2. The company _________its sales by an average of 10% per year since its establishment in 1993. (2016-06)a. increasesb. increasedc. is increasing d. has increased3. We are confident that we_________ our export sales by 15% by the end of this year.a. increaseb. had increasedc. would increase d. will have increased4. We are sure that we ___________our second project by the end of the next month. (2014-06)a. will have completedb. had completed c. completedd. were completing5 Since the new technology was introduced last month, we ___________in speeding production.a. succeed b. succeeded c. have succeededd. will succeed6. After the bargaining progress _________, a final agreement was signed. (2018-12)a.iscompletedb. had been completedc. has completedd. had completed7. I am interested in the training course, which _____ at Hilton Hotel in Beijing from March 8 to 12, 2018. (2017-12)a.heldb. was heldc. will holdd. will be held8. Thetraffic was making so much noise that I couldn’t hear what he _____. (2017-06)a.is sayingb. was sayingc. has saidd. will say9. Since the beginning of 2013, these regulations ______ in most workplaces across the country. (2016-12)a.will be introducedb. are introducedc. have been introducedd. were introduced10. When we receive the goods you return to us, you ______ a full refund within 15 workdays. (2015-06)a.gotb. will getc. have gotd. are getting11. After they ______ the first super computers in the 1940s, scientists and engineers began to develop ways to create networks. (2016-06)a. createb. createdc. have createdd. has created

It ______ five years since he has left for Beijing.

A. was
B. have been
C. is
D. is going to be