Who are you waiting ________ the school gate， Millie

选出含有相同音素的一组______.

, he can answer the difficult questions.

There was thick haze（雾霾）in our city this spring. What do you think of it—I think ______ cars we drive, ______ pollution our city will have.

28．She’ll never forget her stay there ________ she found her son who had gone missing two years before