__world, where computers rule ourwork and life, online searches have become _____necessity.

30. Rather than ______ that film, I would rather ______ at home.

You will fail your next exam ______you start to work hard at your study now.

－ Whose isthis blue bike －It ________be Mary’s. Her bike is black and white.

He is only too ready to help others, seldom, _____ , refusing them when they turn to him.