根据中文提示，用词组的适当形式填空。每空一词。

1. She ___________ ___________（收到……来信） her pen friend yesterday.

2. All the athletes ___________ ___________（对……满意） with the nice service during the Beijing Olympics.

3. ___________ ___________（到目前为止），many measures have been taken to control the spread of A/H1N1.

4. After the earthquake, he left for Wenchuan as a volunteer ___________ ___________（而不是） a tourist.

5. You_________ __________（最好） check over your exam paper carefully before you hand it in.