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根據句義和給出的漢語注釋或首字母寫出單詞的正確形式。（每空一詞）

1．Wang Ping is the______（第二）tallest student in Class One，Grade Nine．

2．Many teenagers like c     with their friends through QQ on the Internet．

3．It is very important for schools to keep students_______（安全的）because some of them were killed or injured．

4．He came into the room______（安靜地）because the baby was sleeping．

5．Shanghai is one of the biggest c      in China．