The little boy won’t go to sleep ______ his mother tells him a story.
| A．or | B．unless | C．but | D．whether |
The ground is all wet. It _________ last night.
| A．can’t have rained | B．may have rained | C．can have rained | D．must have rained |
Rather than _________ on a crowded bus, he always prefers ________ a bicycle.
| A．ride; ride | B．riding; ride | C．ride; to ride | D．to ride; riding |
We’re looking forward __________ the photo exhibition.
| A．to visiting | B．to visit | C．to having visited | D．visiting |
You will _______ your health if you work so hard，eat a little food and sleep badly．
| A．fail | B．improve | C．help | D．endanger |
My brother，______ his classmates often made fun a few years ago，is now studying in England．
| A．of whom | B．who | C．about whom | D．whom |