Mr. Black is not only strict _____his work but also is strict ____his children.[ ]

How many teachers are there in your school?—About two _________.

_________ no doubt that a green campus plays an important role in the growth of students, both physically and mentally.

Having been born on the earth, we had no choice but ________ hospitality it offered.

After reading for an hour, you’d better_______ the green trees for a minute or two.