In the dark street there wasn’t a single person _____ Mary could turn for help.
| A．to whom | B．to which | C．on whom | D．on which |
I graduated from college twenty years ago and I ____________ as an English teacher in this middle school ever since.
| A．worked | B．have been working | C．had worked | D．was working |
___________ ability and experience, he can’t be compared with you.
| A．In terms of | B．In case of | C．In favor of | D．In face of |
___________Mrs Smith worked day and night, he found it difficult to make enough money to support such a large family.
| A．Since | B．If | C．Once | D．Although |
___________ with the size of the whole earth, the biggest ocean does not seem big at all.
| A．Compare | B．Comparing | C．When compared | D．When comparing |
The number of private cars in urban areas should be limited ___________the number of public buses should be increased.
| A．when | B．while | C．unless | D．until |