They ___ every means, but the engine __ work.
| A．tried; couldn't | B．have tried; won't | C．tried; won't | D．have tried; can’t |
All the preparations_________, we're ready to start.
| A．made | B．being made | C．having made | D．have been made |
--Do you know when the Chinese custom_________ from?
--It's hard to say. But its characteristics__________ the Tang Period.
| A．began ; prove | B．started ; show |
| C．is ; appear | D．dates ; suggest |
After you have used the dictionary, please just put it back______it belongs.
| A．where | B．to which | C．what | D．that |
It is usually not quite cold in this area in March, but sometimes temperature________ be very low.
| A．should | B．can | C．must | D．shall |
Their tent,__________ light as a feather, remained firm in the storm last night.
| A．as if | B．even | C．though | D．if |