.I was about to get on the bus __________my wife phoned me to back home at once.
| A．when | B．while | C．until | D．after |
. ______ are allowed to take part in the outdoor activities.
| A．Old enough children to dress themselves | B．Children enough old to dress themselves |
| C．Children old enough to dress themselves | D．Enough old children to dress themselves |
How long do you think it will be ______ the Chinese people land on the moon?
| A．that | B．since | C．until | D．before |
---Will you be _________ this evening, Mary?
---That depends. I am afraid I will be with my manager together discussing a plan.
| A．convenient | B．suitable | C．available | D．efficient |
Don’t quarrel with your friend, ________will damage your friendship．
| A．who | B．which | C．that | D．what |
The White Horse Temple in Luoyang is one of the first historic buildings________ to receive special state protection.
| A．listed | B．having been listed | C．being listed | D．listing |