1．We restrict(限制) the number of students per class to 50.
2．He stared at the diamonds with greedy(贪婪的) eyes.
3．I asked three building firms to estimate for the repairs to the house.
4．We saw a man enter the room like a thief in the night.
5．In that country most crimes are committed by young men.
6．Contrary to some of the reports that you see, crime(犯罪) along the border is down.
7．Factories are grouped in the southern suburb(郊区) of the city.
8．Next time when we go to the beach we should be careful with our garbage．
9．He had administrators under him but made the crucial(关键性的) decisions himself.
