．At last, the boys found themselves in a pleasant park with trees providing shade and__________down to eat their picnic lunch
| A．to sit | B．sat | C．sitting | D．having sat |
In ____ accident _____ knowledge of first aid can make _____ real difference.
| A．an; a; a | B．the; a; the | C．an; the; 不填 | D．a; a; 不填 |
In order to continue to live well when we leave school, we must _______ learn some useful skills as well as study in the school.
| A．in all | B．above all | C．after all | D．at all |
In recent years, laws have been passed to stop wild animals from _______.
| A．killing | B．to be killed | C．being killed | D．having killed |
To their great _______, they found their son arrived home safe before the storm.
| A．surprise | B．relief | C．amazement | D．disappointment |
We would appreciate _______ if you could give us some advice on how to solve this problem.
| A．that | B．you | C．it | D．this |