As is known to all language learners, the newly learnt words will soon be forgotten unless ______ used in everyday communication.
| A．gradually | B．frequently | C．accurately | D．familiarly |
I am so glad that I have found the same modern computer ____ I am working on.
| A．which | B．as | C．that | D．where |
We should do more such exercises in the future, I think, ____ we did yesterday.
| A．as | B．which | C．that | D．than |
____ 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 |