.You look tired .______ working indoors you should be out for a walk.

There are fewer and fewer tigers in India. The situation will continue ______ humans stop hunting them for their fur and bones.

His proposal is very _____. We do not need any explanation.

The World Expo (世博会) in 2010 Shanghai was held. The theme of the Shanghai Expo is “______”.

al evidence began to ______,suggesting that the new drugs had a wider range of useful activities than had been predicted from experiments in animals.