—How long can I keep the book? —A week. You _____to return it by Monday.
Cheer up, Maria! You can also enjoy _____ you have been dreaming of, if you don’t lose heart.
The medicine won’t cure the disease -- it ________stops the pain.
The people who objected to cloning human beings went on strike and _________ the traffic.
Only after he realized the significance of mastering two languages __________ English carefully.
_________ with common sense can tell the difference between the two.