When I got to the school, the first class _____.
You’d better ______ your flight reservation at the latest 3 days in advance.
He didn’t make ______ at all in yesterday’s negotiation. What happened to him?
—Oh, let’s go to that restaurant right now for lunch! —______ They serve food 24 hours a day.
She seems_happy in her new job since there is nothing troublesome to bother her.
The recent research attempts tothe effectiveness of different drugs used for the new virus.