1£®The experiment ¡¡performed¡¡ (perform) in the 1990s showed that many plants tolerate a wide range of light conditions.

2£®She pretended ¡¡to be doing¡¡ (do) her homework when her mother came in.

3£®After graduation£¬he has been working in a middle school which ¡¡is attached¡¡ (attach) to Nanjing Normal University.

4£®Xi delivered keynote speech at BRICS Business Forum£¬¡¡calling¡¡ (call) for more people to benefit from international cooperation.

5£®Walking is a good form ¡¡of¡¡ exercise for both the young and the old.

6£®He was ¡¡confident¡¡ (confidence) that he would be admitted to the famous university.

7£®Maria has written two novels£¬both of ¡¡which¡¡ have been made into television series.

8£®After months of unemployment all he asked for was a chance ¡¡to earn¡¡ (earn) his bread.

9£®As is often the case in nature£¬some plants are so sensitive ¡¡to¡¡ temperature that they can only survive in cool places.

10£®We appreciated his ¡¡devotion¡¡ (devote) of time and money to the project.