Food safety is _____ important, so the government spares no efforts to prevent food pollution.
—Timmy, it is raining heavily out. Shall we stop here?—_______, we must finish this work today.
When his father came into his room, Tom pretended _______ a book.
Martin was sick with a strange fever; _______, he could neither eat nor sleep.
The company will be left in the _______ of the secretary when the manager is away.
It was last night_______ Mr. Brown came back to his hometown from Africa.