Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months.

This book _______ be Tom’s. Look! His name is on the cover.

What a mess in your room, Jim!—Mum, could you open the bag to ______ my books and stationary.

The movie is so__________, and many of us are ____________ in it.

Do you know when Tonny came back last night? —– Yes. It was not yet nine o’clock _____ he came back home.