Whenever I met her，________ was fairly often，she greeted me with a sweet smile.
| A．who | B．which | C．when | D．that |
While watching television，____．
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the doorbell rings |
To good relationships with your teachers and classmates, you should learn to be on good terms with them.
| A．bring up | B．add up | C．keep up | D．take up |
A great number of studentssaid they were forced to practice the piano.
| A．to question | B．to be question | C．questioned | D．questioning |
________ the tower building，where you can see the whole city
| A．Standing on the top of | B．If you climb to |
| C．When you reach the top of | D．Get to the top of |
Up to now, they _______enough money for students who can’t afford to go to school.
| A．are raising | B．have been raising | C．have raised | D．had raised |