—Look! Someone ________ the floor.—Well, it wasn't me. I went shopping just now.
I’m determined to get a seat for the concert ________ it means standing in a queue all night.
Do you know the 31st Olympic Games _______ in Rio de Janeiro, Brazil, in 2016?
The pupils asked their teacher ___________round the earth.
Sally is the girl _____ I think is likely to win the first prize in the competition.
You’d better______, or you may be cheated by your so-called net friends.