Scientists are convinced______ the positive effect of laughter______ physical and mental health.
| A．of ; at | B．by ; in | C．of ; on | D．on ; at |
It’s quite strange that the man sleeps with his mouth ____ and his eyes _____.
| A．closing; open | B．closed; open | C．closing; opening | D．closed; opened |
Only by shouting at the top of his voice .
| A．he was able to make himself hear | B．he was able to make himself heard |
| C．was he able to make himself hear | D．was he able to make himself heard |
When _____ the letter, tears came to her eyes.
| A．she was reading | B．reading | C．she reading | D．read |
Cleaning women in big cities get by the hour.
| A．pay | B．paying | C．paid | D．to pay |
She felt rather _______that she should drive the car at such a___________ speed.
| A．frightening, frightening | B．frightened, frightened |
| C．frightened, frightening | D．frightening, frightened |