he rapid development of medical science, we ___more new drugs used in the treatment of cancer

The subjects students study in America are different from those in China.

It’stoo cold in the room. Please keep the door _______.

The truck ______ the trainees miles fromanywhere and they had to reach the stated destination within 5 hours totally onfoot.

How many animals are there in the zoo—There are over ________ in it.