15. If you want a ticket for a round-trip, sir, you’ll have to pay _______ $80.
A another B other C each D more
16. We couldn’t buy anything because _______ of the shops opened at that time.
A all B some C any D none
17. This machine is very easy to use. _______ can learn to use it in a very short time.
A Somebody B Anybody C Nobody D Few people
18. I can _______ swim _______ skate. Will you please teach me?
A either , or B not only ; but also C both; and D neither; nor
19. They were all asleep. _______ of them heard the sound.
A Both B All C Neither D None
20. The father wished the twins to be doctors, but _______ of them liked to study medicine.
A both B neither C either D none