George _________ too far.His coffee is still warm.( )
must have gone
might have gone
can't have gone
needn't have gone
Tom’s English is not good, so he devoted all his free time to __________ it.
To his surprise, Jack found his son _______as Santa Claus on Christmas Eve.
______ his expression, he didn’t _____the driving test.
The man kept silent in the room unless_______.
Let those in need ________ that we will go all out to help them.