“Darwin teaches us that life _________ continually ________ to keeping up with a changing Earth.” The expert explained.
| A．is; adapting | B．has; adapted | C．will; adapt | D．does; adapt |
Planning so far ahead _____ no sense — so many things will have changed by next year.
| A．made | B．is making | C．makes | D．has made |
—Is everyone here? —Not yet ... Look, there _____ the rest of our guests!
| A．come | B．comes | C．is coming | D．are coming |
Listening to loud music at rock concerts _____ caused hearing loss in some teenagers.
| A．is | B．are | C．has | D．have |
Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.
| A．are; are | B．is; is | C．are; is | D．is; are |
The factory used 65 percent of the raw materials, the rest of which _____ saved for other purposes.
| A．is | B．are | C．was | D．were |