根据句意及汉语提示完成句子
Don’t be too _________(担心) about your son .He is old enough to look after himself..
There are twelve boys and girls here. Can this birthday cake be ________(划分) into so many pieces?
We tried another way to work out this problem, but that didn’t work _________(也).
It is a good          (选择) to make a list of all the things you need to do.