It is known to all that a proper amount of exercise ________ to good health.
| A．benefits | B．contributes | C．values | D．improves |
____ it will do us harm or good remains to be seen.
| A．If | B．Whether | C．That | D．Where |
The river, ____ are covered with trees, is very long.
| A．which banks | B．of which banks |
| C．whose the banks | D．the banks of which |
He is rather difficult to make friends with, but his friendship, ____, is more true than any other.
| A．once gained | B．when to gain |
| C．after is gained | D．while gaining |
— Did you enjoy yourself at the party?
—Sorry to say I didn’t. It was ____ a meeting than a party.
| A．much of | B．more like | C．less of | D．more or less |
— Have you known each other for long?
— Not very long, ____ we started to work in the company.
| A．after | B．before | C．when | D．since |