The train _______ at the present speed until it reaches Beijing at about 6 :30 am.
| A．went | B．has gone | C．goes | D．will be going |
—Why do you always lie to our mother you love her cooking?
—It's only a white lie, so _______．
| A．don't bother | B．my pleasure |
| C．it's no big deal | D．mention it |
My colleague has been recovering gradually since the operation, and it wont’ be long ______ he comes back to work．
| A．before | B．since | C．after | D．when |
Don’t you know ______, my dear friend, it is you that she loves?
| A．who | B．which | C．that | D．what |
She was so angry and spoke so fast that none of us understood ______ he said meant．
| A．that | B．what | C．that that | D．what what |
What will people die of in 100 years? If you think that is a simple question, you ______ attention to the revolution taking place in biotechnology．
| A．have not been paying | B．had not been paying |
| C．were not paying | D．will not be paying |