——This wall of air is an effective answer to the problem and it ____ work.——But it is a question to put such a wall of air around the statue.

It’s unbelievable that such a small girl ____ have so much knowledge about computer.

I would have met him ______ to the cinema last night.

 — There's someone outside. Who it be ?— It must be Mary. She promised to come over at 8: 00.

But for your timely help, the boy ______ his life.