1 . He has spent all his life on the research and ______ (develop) of better rice plants. (所给词的适当形式填空)

2 . With the ______ (raise) of standards of this school, more and more parents are trying their best to send their children to study here. (所给词的适当形式填空)

3 . Scientists are carrying on ______ (far) research on Mars. (所给词的适当形式填空)

4 . Mandela made a great ______ (contribute) to the equal rights of black people. (所给词的适当形式填空)

5 . Many changes ______ (take) place in our daily life since the light rail was built. (所给词的适当形式填空)

6 . I really don’t know who ______ (ask) for help in this city. (所给词的适当形式填空)

7 . He made lots of mistakes because of his ______ (care). (所给词的适当形式填空)

8 . My new pen writes ______ (smooth) and I like writing with it very much. (所给词的适当形式填空)

9 . Western food is far less ______ (taste) than traditional Chinese food. (所给词的适当形式填空)