Some complain that visitors are too much stress on the environment．（cause）
月球上的食物很可能会以药片的形式存在，而且味道没那么可口．
Food on the moon would most probably be pills and would not be tasty．
一天工作之后，他精疲力尽．
After a day's work，he was ．
结果证明，谋杀案和那个工程师无关．
It turned out that the engineer the murder．
约翰太粗心了，不能照看好他的宠物．
John is look after his pets well．
老师要求我们按时上交作业．
Teachers require us to our homework on time．