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 |
—What about __________ lecture yesterday?
—Well，__________ most boring one indeed.
| A．／；the | B．the；a | C．the; the | D．／；a |
I think the biggest problem in banning smoking is ______ people can buy cigarettes easily.
| A．that | B．whether | C．where | D．how |
— Have you told your parents about your decision?
— Not yet. I can hardly imagine ______ they will react.
| A．what | B．that | C．how | D．when |
—Did you sleep well last night?
— No, the loud noise from the street ______ me awake for hours.
| A．had kept | B．is keeping | C．has kept | D．kept |
The App WeChat provides a networking platform ______ communication is faster and easier.
| A．which | B．where | C．when | D．why |