Not everyone has realized what_______ important part the balance of________ nature plays in their life.
--- How many students are there in your school? --- There are 2,000 students here __________.
____________ two exams to worry about, I have to work really hard this weekend.
While shopping, people sometimes can't help ________ into buying something they don't really need.
The teacher bought many books for her students, which _____ 500.
My younger brother dreams ________________ a spaceman.