He is _______ clever boy that he can solve _____ many difficult problems.

–What’s his phone number?-_______ 257-6890.

I found a story-book on the desk, it isn’t mine, it is ___,I think.

--- _______city is the capital of China?---Beijing is .

Look! The students are playing on the playground. Some are running, some are playing basketball, ________ are watching.