根据句意选择正确的单词填空。
1．The plane landed on the airport_________（safe，safely）．
2．Don’t you think we need time and_________（free，freedom）to relax．
3．Don’t rush in the street，it’s really __________（danger，dangerous）
4．The little boy can dress__________（him，himself）．
5．She makes a _________ （decide，decision）to study hard from now．
6．She fell off her bike．_________（lucky，luckily），she didn’t hurt herself．