Sam_______ some knowledge of the computer just by watching others working on it..
| A．brought up | B．looked up | C．picked up | D．set up |
Mr. White ________ at 8:30 for the meeting, but he didn’t show up.
| A．should have arrived | B．should arrive |
| C．should have had arrived | D．should be arriving |
I told Sally how to get here, but perhaps I ________ for her.
| A．had to write it out | B．must have written it out |
| C．should have written it out | D．ought to write it out |
Jenny ________ have kept her word. I wonder why she changed her mind.
| A．must | B．should |
| C．need | D．would |
I was really anxious about you. You ________ home without a word.
| A．mustn’t leave | B．shouldn’t have left |
| C．couldn’t have left | D．needn’t leave |
Tom ought not to ________ me your secret, but he meant no harm.
| A．have told | B．tell |
| C．be telling | D．having told |