The number of people in their class _______51.

The poor ______ living in the mountain ____ top is covered with green trees.

 The drug used to treat this disease causes bad side effects, some of which ________ deadly.

 The farmers eat only 20 percent of fruits they grow, the rest of which _____ sold to the supermarket.

Every student as well as teachers who ____ to visit the museum_____ asked to be at the school gate on time.