用括号内所给单词的适当形式填空。
1.I'm going to the university to get further ________(educate) after finishing middle school.
2.No matter how different the work is，we will manage ________(complete) it on time.
3.I'm old enough to make my own ________(decide).
4.Teenagers shouldn't be allowed to get their ears ________(pierce).
5.You should put the medicine to ________(safe) to keep the kids away.