1 . Nowadays many people travel across China ________ high-speed trains.

A．on behalf of	B．by means of
C．at cost of	D．in terms of

2 . 选词填空

A. in case of     B. on behalf of        C.no wonder     D. at liberty       E. in conclusion

1. He had made a thorough investigation, ________he knew so much about it.
2. ________ the staff, I wish to extend our warmest welcome to you.
3. He has just installed a safety device for his car ________ break failure.
4. ________, walking is a cheap, safe, enjoyable and readily available form of exercise.
5. All people are ________ to express his own opinion.