His father is __________ engineer and he works __________ research.
—What happened last night? —There was a fire in the hotel. Luckily, it was soon ________.
—We should do what we can ________ the endangered animals. —Yes, it’s our duty_________ them.
—Do you know anything about the players of our school basketball team? —Yes. They are _______ young boys between the age of thirteen and fifteen.
—Excuse me. Where is the cafe ? —Take the elevator _____ the third floor and turn left. And it is _____the bank and the bookstore.
—Could you tell me someexamination skills? —Sure. In the exam, the _______you are, the_______ mistakes you’ll make.