Why hasn’t she come to the party? —– I’m afraid she can’t. She is _______ in preparing her graduation paper.

The captain urged that the mission ______before dark

The point is that no medicine is ________for children when they are infected with the hand-foot-mouth disease ．

has been trying to bring its nuclearcrisis under ____ control, but ____ spread of radiation has raised concernsabout the safety of the nuclear energy

0 years yesterday–No, it was cloudy above my city at thattime