Sarah pretended to be cheerful，________nothing about the argument.(2011·全国Ⅱ)

Is that ______ volleyball—Yes. Jim likes playing ______ volleyball. ______ volleyball is his.

David’sister often her pocket money on books and magazines．

_______ cleaning the yard and making up the beds for the old, we also read newspapers for them and had chats with them.

I must go there earlier. John has suggestedthat I ________ an hour before the discussion begins.