What was the teacher doing at that time?—He lessons at school.

The boysknock ___Uncle Wang’s door and shout “trick or treat”. He gives them some candy___a treat.[ ]

The road back home may be difficult before the Spring Festival, ______ the desire to get together with family members can never be stopped.

It was rainy all day. We had to stay _____ home. [ ]

___________a time in the