David is clever and quick at work,he is honoured with the title of model worker.

This chair is black and that is orange chair.

How long do you think­­­_________Obama officially takes office in the White House?

I don’t like this film . What about you, David?—- _______________ . It’s so boring.

After that, he knew he could _______ any emergency by doing what he could to the best of his ability.