There was ______ time _____ Chinese used foreign oil.
| A．/; when | B．a; while | C．a; when | D．/; while |
In case of emergency, whether knowing how to apply first aid or not really ________ in matters concerning wounds like swollen wrists, broken arms, burns, cuts, and so on.
| A．makes difference | B．makes a difference |
| C．makes differences | D．makes different |
Water is vital _______every living thing ______, without which the world would be a dead place.
| A．to keeping; alive | B．to keep; living | C．to keeping; lively | D．to keep; alive |
A cut in the tissue is easy to heal but a(an) _______ to the heart, if possible, takes a long time to do so.
| A．injury | B．damage | C．hurt | D．wound |
It is several years since he ______ ill and his illness _______ great damage to his health.
| A．fell; has done | B．fell; does | C．was; had done | D．felt; has done |
Medicine bottles should be clearly labeled and ______in places ______ are out of children’s reach.
| A．kept them; where | B．kept; which | C．kept them; that | D．kept; where |