Bob would have helped us yesterday, but he_______
| A．was busy | B．is busy | C．had been busy. | D．will be busy |
I __________ a few words of Greek when I was there last year.
| A．picked up | B．ended up |
| C．poured down | D．came down |
I __________ to be out when you called me this morning.
| A．seemed | B．appeared |
| C．happened | D．thought |
-I was amazed to find that you are an excellent cook.
-I have experience __________ cooking at an Italian restaurant.
| A．of | B．in |
| C．at | D．on |
Strong __________ can be very dangerous for swimmers.
| A．flows | B．columns |
| C．floods | D．currents |
Mr Brown is a（n）__________ secretary in our office, for he is able to do tasks successfully, without wasting time and energy.
| A．effective | B．efficient |
| C．flexible | D．sufficient |