—How long have your parents ____________?—For about 15 years.
— Whose shoes are these?— They ____ be Mike’s. They are much too large for him.
The little child was too _______ to hear the end of the long speech.
We should learn_______ each other.
Attention , please! All the mobile phones _________during the meeting.
-These plans are all nice. I haven’t decided which one to choose.-It’s OK. You ________ plenty of time to decide.