John has put on so much weight recently that his mother has to_____ all his trousers to his measure.
—Did you write to Grace last summer? —No, but I'll ______ her over Christmas vacation.
In summer people usually stay up late outside, ______ the cool air.
The foreiger knows little about ______ is called "Hope Project" in China.
He was born ____ a very cold night _____ December.
When he knocked at the door, my mother was busy ____ supper.