---Has your father come back from Africa?
--- Yes, but he ______ here for only three days before his company 
sent him to Japan.
| A．was | B．has been | C．will be | D．would be |
--What can I do for you,sir?
----I”d like to see the manager ________of sales department.
| A．in the charge | B．in charge | C．is in charge | D．under charge |
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 |