________ one of my old friends while doing shopping in a supermarket，whom I hadn’t seen forten years.[ ]

See the flags on top of the building? That was we did this morning.

There _____a number of books in our school library. The number of books _______ getting larger than last year.

If Mrs. Brown ____ more exercise, she will be bettersoon.

It’s fun _____ lantern riddles during the Lantern Festival.