As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
| A．primary | B．alternative | C．instant | D．unique |
Mr Green drove slowly on the way home until he reached the high way, ______the speed limit was 60 miles per hour.
| A．because | B．which | C．where | D．that |
As we have planned, we’ll go to Beijing to attend her sister’s wedding party. We’ll also visit our mother school _______we go there.
| A．unless | B．when | C．once | D．even if |
— If you don’t like the white shirt, take the light yellow one.
— OK, but do you have ______ size in light yellow? This one is a bit tight for me.
| A．a big | B．a bigger | C．the bigger | D．the big |
After five hours’ drive, they reached ______ they thought was the place they’d been dreaming of.
| A．that | B．where | C．which | D．what |
It’s said that there are plenty of hotels in that town. There ______ be any difficulty for you to find somewhere to stay.
| A．wouldn’t | B．mustn’t | C．shouldn’t | D．needn’t |