質問: わかる方教えてください・ https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q13209888323
1 My mother has been (on ) a diet for two months.
2.This drug cases the pain ( for ) a large extent.
3.I 'll inform you (of) the details about the accident later.
4.Yuka is busy (with) homework and club activities.
5.What do you usually use your credit card (to)?