Thefluisbelievedbyvirusesthatl

The flu is believed ____by viruses that like to reproduce in the cells inside the human nose and throat.

A．causing

B．being caused

C．to be caused

D．to have caused

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Where on earth have you been? We __ you back much earlier.

A．were expecting

B．are expecting

C．had expected

D．expect

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Jack’s___ brother is __ than him.

A．old; elder

B．elder; older

C．old; eld

D．elder; younger

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He works in a factory now, but he__ on a farm for 20 years.

A．worked

B．has worked

C．had worked

D．had been working

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A．a three feet deep hole	B．a hole of three feet
C．a three feet deep hole	D．a hole of three feet deep

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Glad to see you back. How long __ in Russia?

A．did you stay

B．have you stayed

C．were you staying

D．have you been staying

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