Do you think he is lazy？” “I _____ so once, but I don’t now.”
| A．may have thought | B．can have thought |
| C．may think | D．might think |
See the flags on top of the building? That was _______ we did this morning.
| A．when | B．which | C．where | D．what |
Our club is open to adults only.________your children have entered without permission.
| A．There seems that | B．It seems to be | C．There seems to be | D．It seems that |
I want to know ______the thief was caught on the spot.
| A．which | B．that | C．what | D．whether |
The old lady’s hand shook frequently. She explained to her doctor ________ this shaking had begun half a year before, and ________, only because of this, she had been forced to give up her job.
| A．when; how | B．how; when | C．how; how | D．why; why |
A beam of light will not bend round corners unless______to do so with the help of a reflecting device .
| A．having been made | B．being made | C．made | D．you make |