While it may be more convenient to （) a car, it is also expensive and troublesome at times.

Please contact us at 4777 8886 whenever ______.A．it will be convenient to youB．you will be

______ I prefer shopping online because it is more convenient and saves time and money.A．I

A daily dose of laugher may be good for the heart because it makes blood vessels work more

It may be necessary, in order that future【C1】______can enjoy clean air, that more of the【C

For a family of four, it is more convenient as well as cheaper to sit comfortably at home,

Schooling can be predictable while education may