In the country the price of vegetables________ sharply in a short time, which arises panic among some customers.
A heavy learning burden leads to unhealthy behaviors such as poor eating habits, which ___ damage the health of students.
How did you ___ to paint the whole house in a week?
Black clouds had completely ___ the sun.
It was an unpleasant subject ____ we _____ for a long time.
It must have rained last night, ________ the ground is wet now.