根据所给单词的适当形式填空。

1．Things went from bad to worse. The longer people waited for help，the ___the situation became．(danger)

2．A large amount of research ________ to understand sleep recently ．(do)

3．The old dresser needs ____ again．(paint)．

4．He has some problems _____ up the plan．(make)

5．Teenagers should ____ to choose their own friends．(allow)

根据句意，用所给单词的适当形式填空。

1．There are too many new words in the         （twelve）unit．

2．What you've said is         （possible）true．

3．The longer people waited for help，the         （danger）the situation became．

4．Mike can still remember         （give）a bike as a present on his 18th birthday．

5．The government had some laws         （change）after the meeting．