在下列各句的空白处填入一个最恰当的单词，使句子意思完整，语法正确。

1.  Strawberries are red, but peaches are______.

2.  The seats in the restaurant arc very ______ ,  and people don't feel comfortable at all.

3.  At my birthday party, mom ______my friends with a big cake that was made by herself.

4.  Everyone in our group joined a clean-up______.

5.  I  was late for class this morning because of the______ traffic.

国防现代化的最主要标志是武器的现代化。（）