求助！能帮我填下下面的句子吗？是介词填空

1. Simon and John plan to go to the countryside _______ riding their blcycles.

2.If you are poor _______ solving maths problems, you should practise them more often.

3.I will talk _______ reading English novels in my lecture tomorrow.

4.The bowl of water on the table is _______ washing your fingers during the meal.

5.Mr Ray is an expert _______ teaching deaf children

1.by

2.in

3.about

4.to

5.on

第三个不确定

on in about in in

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