When did the universe________________?

Sleep can influence people's _______________.

Various factors____________ his failure.

The fibers are made from oil—a___________ resource.

There are ______________ between the two.

We must________________ each task.

Fresh air is____________to good health.

Knowledge without __________ counts for little.

She is a girl who is eager to follow ___________ fashions.

Poor nutrition leads to__________ .

We must not ___________ their demands.

A new rule will soon_________________ .

The increased use of non-renewable energy will ___________ global developmen in the future.

Experts believe that the increaseing rate of death __________ driving cars.

We should ______ an amount of money in case something unexpected happened.

The success of e-commerce _________ completely realizing online payment.