After decades of effort, the city is still trying to _____ how to ban smoking in public places.
| A．look through | B．get through | C．figure out | D．take out |
---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 |
—Some English idioms are difficult to understand.
—Exactly, ________ you know the meaning of each word.
| A．if only | B．even if | C．as if | D．now that |
. Whether ways will be found to stop pollution or not is just ______ worries the public.
| A．which | B．that | C．what | D．where |