It was last year _____ I visited the museum _____ you had visited.
“I’d like to give my thanks to those__________help my son will be able to survive his terrible disease,” said the woman on TV.
There _____ an English speaking contest(演讲比赛) for middle school students in our city in early July.
Someone is knocking at the door. Who may it be? —It ______ be Tom. He is still in the school.
If you eat this kind of plant, you ____ very sick. [ ]