His funny hat made the students _____ in class.
—It’s better to________more nature reserves to help save more animals in danger.—That’s a fantastic idea.
—He got up as early as possible________he could get to school on time.
The________junk food you eat, the________you will be.
— The problem is a bit difficult .— ________ask your teacher for help?
—Did you know that the earth is the home of animals?