Nowadays good things _____ to save wildlife in Tibet and many other places with the joint efforts of the government and society.
| A．have done | B．are being done |
| C．are doing | D．will be done |
David worked hard at his lessons ____ he gained high grades in the exams.
| A．so that | B．in order to | C．though | D．because |
As a young man, Zhou Enlai ____ the students movements and later ____ the Communist Party of China.
| A．joined; took part in | B．took part in; joined |
| C．joined in; took part in | D．took part in; joined in |
Camels were ____ better than horses for travelling a long distance.
| A．more | B．far | C．quite | D．very |
When I was in the countryside, I ____ by the riverside every day.
| A．walked | B．was walking | C．walk | D．have walked |
The book has been translated into thirty laguages since it ____ on the market in 1973.
| A．has come | B．comes | C．had come | D．came |