The factory used 65 percent of the raw materials, the rest of which _____ saved for other purposes.

Only if enough evidence is discovered _______ in theexistence of the monster.

You’re sure to make rapid progress if yourplan for study ________ ahead of time.

This kind of desk can be ______ to the height you need.

One of the biggest problems in food production has always been that people have no reliable access to exact information, ____________ is often the case in China