The boys hid themselves in the places ________ they couldn’t be found.—How naughty(淘气的) they are!

Mother’s Day is the second Sunday in May in the United States.

The river______ are covered with trees is polluted.

I turn on the TV for you，Grandpa?一Yes，thanks a lot，my dear. You’re so considerate.

I wasclose to being killed the day before yesterday. A truck passed me at ______ Ithought was a crazy speed.