In communication, a smile is usually _____ strong sign of a friendly and _____ open attitude.

---We can’t expect _____blue sky unless we create ____less polluted world.

We don’t need to do __ extra work this evening. The day’s work was almost at __ end now.

You should have ____ good knowledge of English if you want to find a job here. Because English is the  working language in_______ most international trade centers.

There are_____ large number of people there, so we soon lost____ sight of him.

I ate __________ sandwich while I was waiting for _______ 20:08 train.

The old man leads ______happy life now, but he will never forget ______hard time when he was poor.

I usually don't have______ supper, but I always have ______good breakfast.

I wanted to catch ______ early train, but couldn’t get ______ ride to the station.

If you are in    position of __ teacher, will you allow your students to play computer games all day long?