Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
| A．sense | B．view | C．means | D．idea |
What great trouble the boy _____his father to give up smoking!
| A．had to persuade | B．had persuaded | C．had persuading | D．had persuade |
“I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”
| A．must be | B．must have been | C．might be | D．can have been |
Anyone _______ bags, boxes, or whatever, was stopped by the police.
| A．seen carry | B．seen carrying | C．saw to carry | D．saw carrying |
_______ I take part in a group discussion or try to speak English to someone, I find it difficult to express myself.
| A．If only | B．Every time | C．Now that | D．In case |
I really didn’t know who ______ for the broken window, for none of them admitted that he had done it.
| A．was to be blamed | B．was blamed | C．was to blame | D．was blaming |