题目内容：

定语从句填空

1.He put aside his work to spend more time with his son, ________ just returned from abroad.

2.I would like to express my thanks in a way ______ he could never imagine.

3.The novel coronavirus has had such a deep effect on our life ______ is totally beyond expectation.

4.Lora is the very teacher I like most, with ______ help I have made progress in my study.

5.People are required to wear masks in public places, ______ is helpful for fight against the pandemic(疫情).