are living in_______ world where mouse clicksrule our life, so online searches have become_______ must.

The current international financial crisis is affecting most countries in the world—Would it be at least several years ____ everything returns to normal?

You’d better not _______ these two sentences, otherwise thereaders cannot fully understand you.

The young lady has been looking after her sick mother-in-law______ [ ]

You should try to get a good night’s sleep _______ much work you have to do.