题目内容：

 

1.The man spent much of his childhood_________(observe) birds in the wild.

2.My friend was down with the flu,and_______（因此）couldn't come to the party.

3.He w_______to her so that no one else could hear.

4.I'm full up.I couldn't eat another m________.

5.There are many______________（方法）to improving students's writing ability.