B. and
(Whale Festival is the biggest festival of the fishermen, and it is common.)

A. however
(The discussion was not exciting, however, many people left early.)

A. after
(She will go to the club after she finishes her work.)

D. as soon as
(We will clean up the beach, as soon as it stops raining.)

A. Although
(Although she works all day, she has time to volunteer at a charity.)

B. before
(Don't forget to turn off the lights, before you go out.)

D. because
(Everyone had to carry him, because he was injured.)

C. and
(I bought two toothpastes, and they gave me another one for free.)

B. but
(They went to Hoi An, but they didn't buy any souvenirs.)

A. and
(You can take this medicine, and you can drink hot ginger tea.)

C. What
(A: What was the biggest typhoon?
B: It was the Typhoon Tip.)