根据要求完成句子。

1. We publish our school newspaper twice a month. (改为被动语态)

     Our school newspaper ______ ______ twice a month.

2. The meeting began half an hour ago. (同义句)

    The meeting has ______ ______ for half an hour.

3. I heard that she was singing at that time. (改为简单句)

    I heard ______ ______ at that time.

4. My brother gave my mother a present on her birthday. (改为被动语态)

    A present ______ ______ to my mother on her birthday.

5. My friend seems to be very angry. (同义句) 

   ______ seems that my friend ______ very angry.