There was a lot of fun at yesterday’s party. You _____ have come, but why didn’t you? A must B shouldn’t C needn’t D ought to
I came here to see you.
You should be of your behaviour.
The government has set up a working party to look into the problem of drug ________.
It's high time that we students ______ even harder at our lessons as the national entrance examination is coming nearer.
I haven’t seen ________Maggie since I came here.