简单的翻译，要快（1点15分前再加100）

1，学习举行"保持食堂干净“活动
learn to hold a "keep our dinninghall clean" activity
强烈怀疑“学习”应该是“学校”，如果这样的话就是
Our school is holding a "keep our dinninghall clean" activity.

2，吃多少饭就买多少，吃剩的要扔进垃圾箱了
How much food you can eat, how much you should buy, for what you leave uneaten will be thrown away.

3，按时安排学生值日去打扫
arrange some students to be on duty to clean (the dinninghall)

4，举行保持干净的知识讲座
hold a lecture about how to keep clean

1. study and hold activities on "keep the canteens clean".
2. buy rice that is enough for you. please put the remnant in the dustbin.
3. students on duty must be on time.
4. hold lectures on "keep our environment clean".

1.We will have an activity on learning"how to keep our restaurant clean".
2.You should buy the food according to your own appetite, and the food you can't eat up must be put into the dustbin.
3.Make sur