Work gets done ________ when people do it together, and the rewards are higher too. 

To be an astronaut, you must not only be strong in mind, but also be sound mentally and___.

Interviews were carried out ________ over the telephone，via e－mail or fax or face to face in four cities including Beijing，Shanghai，Guangzhou and Wuhan.

I can’t spend___ money on the car which is ___expensive for me .

. The English magazine is _______ easy; I can go through the articles without much difficulty.