16. The students _________ their books in their bags.
a) keep
b) keeps
c) keeping
d) kept
Answer: a) keep
17. She _________ her brother how to swim.
a) teaches
b) teach
c) teaching
d) taught
Answer: a) teaches
18. We _________ to go on a trip next month.
a) planned
b) plan
c) planning
d) plans
Answer: b) plan
19. The baby _________ asleep during the movie.
a) fall
b) falls
c) falling
d) fell
Answer: b) falls
20. My sister _________ in the garden right now.
a) works
b) work
c) working
d) worked
Answer: c) working
