In fact fuels we burn and plant food we eat ________ their chemical energy in the form of heat.
| A．give in | B．give off |
| C．give away | D．give up |
It's_________you do it fight now_________makes a difference.
| A．what; which | B．what; that | C．that; that | D．how; which |
They _________to see you off at the airport, but they got there too late.
| A．have hoped | B．had hoped | C．would hope | D．hope |
-- Excuse me, Sir. You_________take your camera into the museum.
-- Sorry, I didn't know and I promise you I_________.
| A．needn't; mustn't | B．can't; won't |
| C．mustn't; mustn't | D．may not; needn't |
Jane didn't say_________she would return, but I suppose she'll be back for dinner.
| A．that when | B．when | C．if or not | D．where |
What an accident! If the driver_________ carefully, things would not be as they are.
| A．has driven | B．drove | C．had driven | D．was driving |