1． It is assumed that stress is mainly caused by too much work.
2．If you don't like the school lunch, you have the alternative of bringing your own.
3．She has kept up physical training for several years without interruption (interrupt)．
4．The more we are aware of the significance (significant) of this famous saying, the more benefits we will get in our daily study and job.
5．If you study in a systematic (system) way, you won't leave anything out.
6．The plants need the right amount of sunlight and rain to grow and ripen (ripe)．
7．The mechanic who wishes to do his work well, must first sharpen (sharp) his tools.
8．The escaped prisoner got arrested (arrest) immediately he turned up at the railway station and was sent to prison again.
9．Scientists have identified (identify) more than forty chemicals in tobacco smoke that cause cancer in humans and animals.
10．In contrast to our ignorance of saving food, many people especially those in povertystricken areas are suffering from starvation (starve)．
