As a result of multi-media used in teaching, not only _______, but students become more interested in the lessons．
A．saved is teachers’ energy B．is teachers’ energy saved
C．teachers’ energy is saved D．is saved teachers’ energy
No one is sure of the extent ________ this will affect business．
A．which B．when C．by which D．to which
Stephen Hawking believes that the earth is unlikely to be the only planet life has developed gradually．
A．that B．where C．which D．whose
You can hardly imagine the difficulty the woman had ________ her children．
A．bringing up B．bringing about C．brought up D．brought about
I was late this morning because my alarm o’clock failed to _______．
A．go out B．go away C．go off D．go without
If caught ________ in Singapore, the person is definitely subject to heavy fines．
A．litter B．littered C．to litter D．littering
