問題詳情：
用括號內所給單詞的適當形式填空。
school bought some physics ________(instrument) last week.
supermarket is friendly with all ________(custom).
e are many ________(hero) in our country. We should learn from them.
soup tastes a little ________(salt).
5.A sweater is used for ________(keep) warm.
【回答】
ruments omers
es y ing
知識點：構詞法
題型：完成句子
