If you like art and enjoy looking at the pictures, ________ is an interest.
| A．which | B．that | C．as | D．what |
Scientists are convinced the positive effect of laughter physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on;at |
This is a junior school.You should go to a senior school _____girls of your age.
| A．for | B．about | C．from | D．to |
__ unemployment and crime are high, it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
| A．Although | B．As long as | C．If only | D．As soon as |
The medicine works more effectively you drink some hot water after taking it.
| A．as | B．until | C．although | D．if |