Kate isn’t at school today.Do you know the ____—-She is ill in bed,sir.

Was it under the tree ____ you were away talking to a friend? — SureBut when I got back there, the bike was gone

Ma Huan can play _______chess, but she can’t play __________violin.

I prefer________TV to going shopping with my mother. [ ]

We cannot figure out ______ quite a number of students were infected with the flu.