Look at that little boy wandering about — perhaps he _____ his mother.
| A．will lose | B．is losing |
| C．had lost | D．has lost |
The doctor insisted that the boy_____seriously ill and that he _____on at once.
| A．be; should be operated | B．was; be operated |
| C．be; was operated | D．was; was operated |
—Can you give an example to show how useful a computer is?
—Sure. ___________ people get ___________ information from it every day.
| A．A large number of; plenty of |
| B．The number of; a lot of |
| C．Lots of; a lot |
| D．Many a; a great deal of |
Hurry! Class ________. You know the first class _____ at 7:30.
| A．is beginning; begins | B．begins; is beginning |
| C．is beginning; is beginning | D．begins; begins |
Only when_______ 30 years old ______ to learn English.
| A．was he; did he begin | B．he was; he began |
| C．was he; he began | D．he was; did he begin |
All of us know that China has thousands of islands, _____ is Taiwan.
| A．the largest of which | B．the largest of them |
| C．the largest one | D．one of the largest |