7.The foreign friends hope that they can join the celebration for the university’s 80^th__________ (周年纪念日).

6.He o______________ an important post in government.

5. The development of science and technology calls for_________ freedom.(学术)

4.What I need now is the s____________ of a happy family.

3.A c______________ tells us the names of all the books in the library.

2.We __________ a red ball for a blue one to see if the baby would notice.(代替)

1.Our members have the p_____________ of using the lending service of the library.