— Why not sit in your own seat, Mary?I can’t see the blackboard clearly because two tall boys are sitting _____ me.
I told Tony the exciting news__________ he came back home last night.
---- It’s very important for everyone to exercise. do you exercise? ----Three or four times a week.
---- Is that girl Susan? ---- It ______ be her. She left for Beijing yesterday.
----Shall we go to the amusement park this Sunday, mum? ---- Sure, ________ I am busy.
This is the third time the famous scientist __________ the United States.