You will be successful in the interview __________ you have confidence.
| A．before | B．once | C．until | D．though |
As is known to all, a block of ice will ________ if it is exposed to heat.
| A．increase | B．cut | C．decrease | D．lower |
Last year the number of death increased ________ 2%～5% ________ the year before last.
| A．to; comparing to | B．to; comparing with |
| C．by; to compare with | D．by; compared with |
“I don't think it's my ________ that the TV blew up. I just turned it on，that's all，” said the boy.
| A．error | B．mistake | C．fault | D．duty |
We ________ here at lunch time; we were delayed at the airport, though.
| A．could be | B．should be |
| C．must have been | D．would have been |
She can't help ________ the house because she's busy making a cake.
| A．to clean | B．cleaning |
| C．cleaned | D．being cleaned |