C

1. No (They are in a store)

2. Yes (He always comes there with his mother)

3. No (She wants to buy a gift for her mother)

4. No (They will buy perfume)

D

1. A: What am I going to buy for my aunt and uncle's anniversary?

B: Buy a pocket knife for your aunt and a laptop bag for your uncle

A: okay, is it better to give a gift certificate?

B: I don't think it's a good idea

2. A: What am I going to buy for my older brother's graduation?

B: Buy some cologne

A: Good idea