1．There is a(n) switch(开关)on the wall for turning on the lights.
2．Recycling(循环利用)the textbooks instead of throwing them away is a good idea.
3．The volunteer in the Rio Olympics guided (指引) them back to the seats.
4．Keeping an optimistic (乐观的)state of mind is good for health.
5．Students will get the development at the aspect (方面)of not only intellectual education but also moral education and physical culture.
6．We are taking off now.Please fasten (系牢)your safety belt.
7．The man is looking at the railway timetable (时刻表) to find the time of the train.
8．To our pity，the project had to be abandoned for lack (缺乏)of funds.
