We couldn't fly________because all the tickets had been sold out

A. economical B. economy C. economic D. economics

Before a long journey, people normally take their cars to service stations to________.

A. keep the oil refill

B. make the oil refilled

C. have the oil refill

D. get the oil refilled

Why are you so ........ of his work? He's just doing his best.

A. critic B. critical C. criticize D. criticism

Life always needs a lot of ......

A. innovate B. innovator C. innovation D. B&C

They are working ....., so we are .....

A. effective, satisfactory B. effectively, satisfactory

C. effectively, satisfied D. effective, satisfied

The .... of the model attracts us.

A. efficiency B. effect C. efficient D. effectively

Water .... is increasing this summer.

A. consume B. consumer C. consumption D. consuming

Watching Korean films on TV is a time - .... activity.

A. consume B. consumer C. consumption D. consuming

The .... are requiring us to repair the machines.

A. consume B. consumer C. consumption D. consumers

This energy - .... bulb is not cheap.

A. save B. saved C. saving D. savoury