—Which share is meant for me?—You can take ________ half. They’re exactly the same. 

Due to bad weather we have to put ___ off until next week to go camping in the mountains．

—Do you think playing cards is beneficial to our study?—No，if ________，it can help us kill time when we have nothing to do.

We haven’t enough books for ______ ; some of you will have to share .

You must keep ________ in mind________you are a student and you should obey the school rules.