________on a clear day，far from the city crowds，the mountains give him a sense of peace.
| A．Walked | B．To walk |
| C．Having walked | D．When he is walking |
__________knowledge comes from practice is known to all.
| A．If | B．What | C．Where | D．That |
Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.
| A．when | B．before | C．while | D．since |
______ surprised the hostess most is _______ one of her friends left the party without saying a word.
| A．What, what | B．What, that | C．That, that | D．That, what |
The arrival of the European settlers had a greaton the life of the Native Americans.
| A．fault | B．change | C．effect | D．result. |
I prefer studying English at home ______the match
| A．to watching | B．to watch |
| C．rather than watch | D．rather than to watch |