根据句意及首字母提示完成单词，使句子完整通顺。

1. Grace bought a s______in the Gift Shop when he visited Hong Kong.

2. We can see s______in the aquarium.They have big mouths and sharp teeth.

3. I didn't follow you. Can you say your telephone number a ______?

4. Lily is very busy these days. She is studying for the math c______.

5.Why don't you take an u______?It's going to rain.