Bread and butter____________ for breakfast in many Chinese homes nowadays.
| A．serve | B．servers | C．is served | D．are served |
I got nervous when the woman _____ opposite kept staring at me.
| A．seat | B．to seat | C．seating | D．seated |
--- How do you deal with the disagreement between the company and the customers?
---- The key ____ the problem is to meet the demand _____ by the customers.
| A．to solving; make | B．to solve; made | C．to solve; making | D．to solving; made |
_____ from endless homework on weekends, the students now can have their own activities, such as taking a ride together to watch the sunrise.
| A．Freed | B．Freeing | C．To free | D．Having freed |
You can’t imagine what difficulty we had ____ home in the snowstorm.
| A．walked | B．walk | C．to walk | D．walking |
When asked why he went there, he said he was sent there ____ for a space flight.
| A．training | B．being trained | C．to have trained | D．to be trained |