--The man in a black suit _______ be our youth worker.--- I’m sure it _______ be him. I saw him in the laboratory building some minutes ago.
The official said they__________ a new law to protect the tourists the next year.
The schoolboy _________to the blind man on his Way home yesterday afternoon.
Look,so many passengers__________ with their smart phones on the underground.
I hate travelling by air__________ you usually have to wait for hours before the plane takes off.
Which do you prefer to use to keep in touch with your friends,QQ__________MSN?