We can never forget the days _______ the two astronauts in spaceship worked together and the days ________ we spent together.

We should protect the earth because it’s home to ___ _ animals.

Dosethe building have a long history—Certainly. It ______ 300 years.

.– Who can reach the book on the top shelf? — Jack can. He is ________boy of us all.

It is reported that both of ____________ two kids were saved out of the river by____ university student.— True. He was really brave, wasn’t he