根据首字母，填出正确的单词。

1. Don't s _____ in class. Keep awake, please.

2. A g ______ has a very long neck. It's a beautiful animal.

3. A dolphin is very i ________ because it can act as people do.

4. It has an u _____ face. We are afraid of it.

5. The panda is very shy, so please be very q ________.

乘罐人员不准（）。

A.不准拥挤

B.不准在罐内打闹

C.不准强行上罐