When I approached to the subway entrance, an explosion occurredThis ___my first experience, I got into panic

Is that woman Mrs. Wang –It be her. She has gone to Japan for a holiday.

The new invention made last month would have a varietyof _______ in industry

Don’t you think it necessary that he __________ to Miami but to New York— I agree, but the problem is _______ he has refused to.

I can’t go out to play because I ______my homework yet.