If there ________ no water or air on the earth, all living things would die．

A．is

B．were

C．are

D．will be

The concert last month was ________ that all the audience wanted to attend it once again．

A．so success

B．such success

C．so a success

D．such a success

________ in thought, he sat at the edge of the bed, with his eyes ________ on the letter in his hand．

A．Lost; fixing

B．Losing; fixed

C．Lost; fixed

D．Losing; fixing

He was a painter, ________ the pictures are as important as his life．

A．whose

B．of whom

C．whom

D．for whom

I couldn't ________：The line was busy．

A．go by

B．go around

C．get in

D．get through

The ________ height of the girls who took part in the beauty contest is 1.70 meters．

A．average

B．obvious

C．central

D．regular

________ is obvious that reading in bed does great harm to your eyes．

A．This

B．That

C．They

D．It

It is the second time that I ________ asked by the teacher to answer the questions in today's class．

A．am

B．was

C．have been

D．had been

Early in the day ________ the news ________ the energy were gone．

A．come; that

B．came; that

C．comes; that

D．came; what

She plays the violin better than she ________ in the past．

A．does

B．plays

C．did

D．played