一、 单项选择（20分）
( )1. is too difficult if you put our effort into it.
A. Anything B. Something C. Nothing D. Everything
( )2. This pair of jeans looks nice Sandy because she looks very nice blue.
A. on; in B. in; on C. for; on D. to; in
( )3. I like watching CCTV-4 it can help me learn more about the world.
A. if B. because C. though D. until
