____, Carolina couldn’t get the door open.

Mum, my little sister is crying all the time. —Mary, be !She feels sick. You should take good care of her.

下列各句子中加横线的成语使用不恰当的一项是

It was not until the beginning of the twentieth century_______ to explore space. [ ]

Who’s singing in the bathroom— It ________ be Mr. Brown. Nobody sings like that except him.