用下列单词或词组的适当形式填空

用下列单词或词组的适当形式填空
terrify give up writemake a decisionpay attention tochat
1、My teacher has already_______ smoking.
2、Have you _______ a litter to your father?
3、What ______you?
-I'm _______of snakes.
4、Please_________what I am saying.
5、________on computer for a long time isn't a good habit.
6、With many choices,it's hard to_______.
（要解释,并且写出为什么这么做,比如说是哪种语法,为什么用过去式什么的.）