1. What ______ lovely surprise it was for the students to get ______ precious present individually when their class teacher, John, came back from the ceremony!
A. 不填；a B. 不填；不填 C. the; the D. a; a
2. These surveys indicate that many crimes go _____ by the police，mainly because not all victims report them.
A. unrecorded B. to be unrecorded
C. unrecording D. to have been unrecorded
3. They decided to chase the cow away ________ it did more damage.
A. unless B. until C. before D. although
4. If these shoes are too big, ask the clerk to bring you a smaller ________.
A. suit B. set C. one D. pair
5. It was essential that the application forms ________ back before the deadline.
A. must be sent B. would be sent C. be sent D. were sent
6. Many new ________ will be opened up in the future for those with a university education.
A. opportunities B. necessities C. realities D. probabilities
