一、单项选择。（每个1分，共15分）
（ ）1.—How do you study English? —I study by ___ more.
A. speak B. speaking C. telling D. talking
（ ）2.The work is ___difficult for the boy to do. Please give him some help.
A. too B. of C. at D. by
（ ）3. If you can’t work out the math problem, you can ask your teacher ___some____.
A. on ; help B. for ; helps C. on ; helps D. for; help
