_____was expected, he broke his promise once more, ______left his friends down.
| A．It; which | B．As; which | C．It; as | D．Which ;which |
When firstto the market, these products enjoyed great success.
| A．introducing | B．introduced |
| C．introduce | D．being introduced |
Mrs. Black doesn't believe her son is able to design a digital camera, ?
| A．is he | B．isn't he |
| C．doesn't she | D．does she |
--- Bob's taper recorder is so wonderful.
--- Mine is at least good, if not .
| A．as; better | B．so; very good |
| C．the same; the best | D．so; better |
Research found that children who drank mainly soda were more than twice as likely as those who drank no soda _________ signs of aggression.
| A．showing | B．shown |
| C．to show | D．show |
“The Mozart effect” is a study described in 1993 in Nature ________ aroused public interest about the idea ________ listening to a classical music somehow improves the brain.
| A．that; which | B．what; why |
| C．who; that | D．which; that |