Mum, ______ is my friend, Kate.—Nice to meet you.

下列各组句子中，加横线的词的意义和用法不相同的一组是（ ）

Let’s play computer games.——________________

It’s hard-working ____ him to spend three hours ____the library on Sunday.

other , who____ in the army for five years，is now running a farm in our village.