Is this research centre _____ is full of modern equipment you always mention.
| A．where | B．that | C．the one that | D．the one where |
It was not until the end of the trip ______ I realized what a good feeling it was to have helped someone in trouble.
| A．as | B．that | C．where | D．when |
As a Chinese saying goes,a mountain ______ be too high or an ocean too deep. Therefore, there is no end to our self-improvement.
| A．shall never | B．will ever | C．can never | D．must ever |
Sometimes I act as a listening ear for fellow students ______ what is bothering them.
| A．to talk over | B．talked about |
| C．talk about | D．having talked over |
An increased concentration of carbon dioxide and certain other gases in the Earth’s atmosphere ______ global warming.
| A．contributing to | B．contribute to |
| C．contributes to | D．to contribute to |
New York State has passed a law requiring that all legal contracts _____ in simple, understandable English.
| A．be written | B．written | C．to be written | D．write |