用所给词的正确形式填空。

1. He spends two days______ (work) in the animal hospital.

2.I haven't had anything for three days.  so I am very______(hunger) now.

3. Would you mind     ___  (lend) me your bike to me for a while?

4. After enjoying a sweet song I feel quite   ___    (relax).

5. We must take a      __   (science) approach to the complicated matter.