You and I could hardly work together，________？
| A．could you | B．couldnt' I |
| C．couldn't we | D．could we |
I don’t think _________ possible to master a foreign language without much memory work.
| A．this | B．that | C．its | D．it |
She has already tried her best. Please don’t be too ______ about her job.
| A．special | B．responsible |
| C．unusual | D．particular |
Food safety _____ to customers, which should be the minimum requirement for the food industry.
| A．guarantees | B．is guaranteed |
| C．is guaranteeing | D．guaranteed |
His being late for the performance __________ a complete failure
| A．resulted in | B．resulted from |
| C．as a result of | D．as a result |
It’s already 10 o’clock. I wonder how it ______ that she was two hours late on such a short trip.
| A．came over | B．came out |
| C．came about | D．came up |