—Have you heard from Nelly recently？
—Yes. I his letters and cards many times while I was in Italy.
| A．have received | B．received | C．had received | D．would receive |
The computer system ________ suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out |
| C．broke up | D．broke in |
I can’t believe that you got fined for speeding. I _________ of you as a careful driver.
| A．think | B．thought |
| C．have thought | D．am thinking |
If I ___________ the doctor’s advice and kept a balanced diet, I wouldn’t be in such a bad shape now.
| A．followed | B．had followed |
| C．should follow | D．have followed |
Only after a person has realized the importance of knowledge, ____________.
| A．he can devote himself to learn |
| B．he may devote himself to learning |
| C．can he devote himself to learn |
| D．can he devote himself to learning |
I was fortunate to pick up a wallet ______ on the ground, but unfortunately for me I found my color TV set _______ when I got home.
| A．laying; stealing | B．lying; stolen |
| C．lay; stolen | D．lying; stealing |