根据句意，用括号内所给单词的适当形式填空。
【小题1】He is the fourth (four) child of his family.
【小题2】My father teaches (teach) Chinese in a secondary school.
【小题3】How many waiters (wait) are there in the big restaurant?
【小题4】The schoolbags on the shelf belong to them （they）.
【小题5】The things in the shop are too expensive and there are few shoppers (shop) there.
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解析：要根据时态，人称和固定词组搭配，以及词性随着时态和人称的变化而变化。