I had _________ entered the classroom when I noticed the headmaster was sitting at the back.
—The experiment is of particular importance. —I see. We will carry on with it ________ we can get enough money.
When people move to another country, they often try ________ the customs of their native land.
Working conditions in that company is few clerks stay longer than three hours.
I’m stuck on this problem;you may ask knows better than I.
—What’s that building?— the medical equipment is stored.