Every time Gina catches her employees ____________ time, she reminds them that time is money.
| A．to waste | B．wasting |
| C．wasted | D．waste |
It was the third time that she ______to this mountain village to see the children.
| A．has come | B．had come |
| C．came | D．would come |
I can well remember that there was a time _____I played sports with my close friends in junior school.
| A．what | B．which | C．that | D．when |
While _________the topic of music in class, all the students show great interest in it.
| A．discussed | B．discuss |
| C．discussing | D．are discussing |
Please wait a minute, honey! I _______ my work.
| A．have finished | B．am finishing |
| C．finished | D．finish |
Great changes _________ in many fields since China was open to the whole world.
| A．have taken place | B．took place |
| C．have been taken place | D．were taking place |