-Where have you been recently? -I __ ___ in Hangzhou on business for a week last month.
| A．have been | B．was | C．had been | D．had gone |
The scientist decided to devote his life to ____ pollution from ____ again.
| A．preventing; happening | B．prevent; happen |
| C．preventing; happens | D．preventing; will happen |
Tom kept silent about the accident _________ lose his job.
| A．so not as to | B．in order not to | C．in order to not | D．not so as to |
Iraq has ______ too many wars since 1990, making his people _______ a lot.
| A．got through; pay | B．looked through; face |
| C．gone through; suffer | D．passed through; destroy |
As is known to all, China _______the group of developing countries.
| A．belonging to | B．was belonged to | C．belongs to | D．is belonged to |
We find _______ difficult to talk to him about anything serious.
| A．him | B．he | C．ourselves | D．it |