27．In hot weather, an old tyre can break again easily _____it’s mended

He was asked to _______the facts just as he remembered them.

There is a book ________ on the ground.—Let’s ________ and ask who lost it.

77 — Have all the important letters beendelivered at the first time— I’m sorry _______ only 40% of them

_________ we are very young, _____________ we can speak English well.