If our product ____ unsatisfactory within 7 days in any way, you can take it back.
| A．shows | B．proves | C．makes | D．performs |
No matter how the teacher tried to read it, the sentence didn't __________ to me.
| A．understand | B．make sense | C．turn out | D．make out |
If we applied the special method to the Internet __________ people benefit a lot in daily life, it would be better.
| A．in which | B．through which | C．from which | D．for which |
Without proper lessons, you would __________ a lot of bad habits when playing the piano.
| A．pick up | B．catch up | C．keep up | D．give up |
President Bush said if terrorists __________ the United States, war would be what they got.
| A．declared a war for | B．declared war to |
| C．declared a war on | D．declared war on |
Since the general retired from the army, he __________ himself in writing his memories.
| A．is devoting | B．has been devoted |
| C．had occupied | D．has been occupying |