根据所给情景选择正确的句子。

1. 想知道东西的价格，你问：[ ]

A. How much is it?

B. How many are they?

C. How old are you?

2. 售货员见到顾客说：[ ]

A. How much are they?

B. What time is it?

C. Can I help you?

3. 询问天气是否凉爽，你说：[ ]

A. Is it cool today?

B. Is it red?

C. Is this my ruler?

4. 你觉得东西太贵了，你说：[ ]

A. It's too cheap.

B. It's too small.

C. It's too expensive.

5. 询问鞋子的尺寸，你说：[ ]

A. How much?

B. What colour?

C. What size?