— _____ do you learn English?  — By listening to tapes and reading aloud．

－_______ is it from your work place?－About thirty minutes’ drive.

The question is so hard. None of them can answer it _________.

— ________ have you become so good at English this term ?—By studying grammar and reading English novels.

 ---George, how can you prove the earth is round?---I can’t, sir. ______, I never said it was.