The river ________ are covered with trees is very long.
| A．whose bank | B．of which banks | C．whose banks | D．the bank of which |
Frank put the medicine in the top drawer to make sure it would not be __________ to the kids.
| A．accessible | B．beneficial | C．acceptable | D．addicted |
----Is it my age __________ the boss minds?
----I’m afraid not. He will consider __________ necessary to have an experienced assistant.
| A．which; it | B．that; it | C．which; that | D．that; that |
Tony, would you go and see if Sam has any difficulty __________ his tape recorder?
| A．to fix | B．fixing | C．for fixing | D．fix |
Can you think of some cases __________drivers obviously knew the traffic rules but did not obey them.
| A．which | B．as | C．where | D．that |
The teacher highly recommended that I ___________ more to improve my English.
| A．would practice | B．could practice | C．practice | D．practiced |