26．The researehers delermine what type of plants the virus can infect(感染) and____insects can carry the virus.
| A．those | B．why | C．which | D．How |
She ____ the house the whole morning but it seems to be at least an hour before she finishes it.
| A．has been cleaning | B．cleaned | C．had cleaned | D．has cleaned |
We all ____ Yang Liwei, who is the first Chinese astronaut to take a journey to space.
| A．look down upon | B．look up to | C．put up with | D．add up to |
Tom, you ____ leave all your clothes on the floor like this.
| A．mustn’t | B．won’t | C．needn’t | D．wouldn’t |
I’m writing to tell you that my family ____ wild animals in Kenya next Sunday.
| A．is seeing | B．will be seeing | C．have seen | D．will have seen |
It was the most important tomb ____ had ever been founded.
| A．/ | B．where | C．that | D．which |