请用下面方框内所给的词或短语完成下列英语句子。每项只能用一次。

1．The Chinese unite as one to face any _________

2．Write down the_________，or you will forget it．

3．My brother likes playing outside，so it’s difficult for him to keep his hands_________．

4．If you want to use that bag，you should _________it first．

5．The young scientist___________ live in America．Now he has come back to China．