Riding bicycles makes us ___________. A. to keep healthy B. keep health C. keep fit
“How many students are there in your school?” “ the students in our school ______over two thousand.”
He is _____ unusual writer. He can write _____ useful book.
---- I have very good grade in English this time .---- _______________!
I didn’t understand my parents why they are so strict ______ me ______ my schoolwork.
Both red and black represent _____ . But I prefer to wear red when I feel tired .