They have done things they ought （ ）.
（A）not to do
（B）not to be done
（C）not to have done
（D）not having done
Is it necessary to look up every new word when I come across it in reading? — No. You （ ）, because you are likely to guess the meaning from the context.
（A）can't
（B）mustn't
（C）don't have to
（D）ought not to
Could I borrow your dictionary? — Yes, of course you （ ）.
（A）might
（B）will
（C）can
（D）should
