we use this set of keys for ____ (type)用所给单词适当形式填空

问题描述:

we use this set of keys for ____ (type)用所给单词适当形式填空
the number of the student ____ (be) 45 用括号内单词的适当形式填空

we use this set of keys for 【typing】.
介词 for 后跟动词ing形式
不明白的再问哟,请及时采纳,多谢!