1. b                               

2. a                  

3. d                         

4. c

Transcript:

1. A: How much is the skirt?

B: It’s eighty thousand dong.

2. A: How much is the T-shirt?

B: It’s fifty thousand dong.

3. A: Excuse me, how much is the book?

B: It’s forty thousand dong.

4. A: How much is this gift?

B: It’s sixty thousand dong.