Take ______ over there. A. the NO.12 bus B. NO. the 12 bus C. NO.12 bus
He didn’t study hard, so he was afraid ______ in the exam.
I had some problems _____ my homework.
Can you learn English ________ chatting on the Internet?
He thinks _____ history about Chinese is very important.
How many states _______ the United States? Fifty.