—You were out when I dropped in at your house.
—Oh, I_______ for a friend from England at the airport.
| A．was waiting | B．had waited | C．am waiting | D．have waited |
The education system rather than the teachers __________for the overburden on the students．
| A．are to answer | B．is to answer | C．are answered | D．is answered |
It is hoped that you can make some adjustments about the quality of your service the reactions of the customers.
| A．in return for | B．in response to | C．in favor of | D．in charge of |
I broke my relationship with John because he always found_______ with whatever I did．
| A．error | B．mistake | C．fault | D．failure |
Without proper lessons, you could ________a lot of bad habits when playing the piano．
| A．break up | B．pick up | C．catch up | D．give up |
There are so many tall trees in the forest,______________.
| A．some of them measures over 50 meters | B．some of which measuring over 50 meters |
| C．some of them measuring over 50 meters | D．some of which measures over 50 meters |