1 . If she had been aware that the mushrooms were ________ (poison),she wouldn’t have picked them for dinner. （所给词的适当形式填空）

2 . Mr Black will be in charge during my________ (absent). （所给词的适当形式填空）

3 . You should make ________ clear how much the person means to you and how hard he or she has worked for you.（用适当的词填空）

4 . I must make an________ (apologize) to him for not going to his party. （所给词的适当形式填空）

5 . —-Who’s the man over there? Is it Mr. Black?
—It______be him. He’s much taller.

A．may not

B．can’t

C．will not

D．mustn’t