The primate brain is larger than of other animals.
| A．those | B．what | C．this | D．that |
This robot is supposed to save a lot of labor, but it remains a problem
if it ______.
| A．is | B．saves | C．does | D．has |
George applied for the position three times ______ he finally got it.
| A．before | B．until | C．when | D．after |
With his eyes ______ on the family album, he thought of the fun he had when
he lived with his parents.
| A．fixing | B．fixed | C．to be fixed | D．being fixed |
The country life he was used to _____ greatly since the opening policy.
| A．change | B．has changed | C．changing | D．having changed |
He went there, _____ some books and call on an old friend of his.
| A．bought | B．buying | C．buy | D．to buy |