A:Hi,Mary.
B:Hi,Linda (16)
A:I'm going to the mall.(17)
B:Sure,I'd love to.What are you going to buy?
A:(18)
B:A trip?
A:Yeah.I'm going to the seaside with my parents.
B:Wow!Hem long are you slaying there?
A:For three days.
B:(19)
A:Um,an umbrella,sunglasses and…
B:I think you should also bring some medicine.(20)
A:OK Thanks.Let's go.
A.I want to buy something for a trip.
B.Do you have anything to buy?
C.And care about your health.
D.Would you like to go with me?
E.I'm going on a trip.
F.Where are you going?
G.So you must have many things to buy.