补全对话。
A: Let's have a look in the South Seas Shopping Centre.
B: All right, but mind the steps 1.__________ you go in.
A: Thanks. Let's go along this way.
B: OK, but watch out. The floor's wet. You 2.__________ slip.
A: Here's 3.__________ antique shop. Let's go in.
B: Right, but take care. Don't break anything.
A: Oh, I like this vase. I'll just pick it up and…oops!
A: Look out! You almost 4.__________ it.
B: Gosh, the label says it's 900 years old. But it only 5.__________ 64 yuan. I'm going to buy it.
A: Be careful. Are you sure it's real?
