______ is important for us ______ learn computer.

— ______ do I save the document on the computer?—Please click “save” and write a name for it

—________ do you update your micro blog (微博)?  —Twice a week.

---Jack, _______ have you been away from your hometown?---Since the end of last February.

—It is selfless   the most beautiful teacher—Yang Xiangming to lose his life     the child in the river.—I think so, he is so great.