His opening up _____ food processing factory is _____ comfort to his parents.
| A．不填；a | B．a; 不填 |
| C．a; a | D．the;不填 |
According to a UN report, some 844 animals and plants __________ in the last 500 years.
| A．disappeared |
| B．were disappeared |
| C．have disappeared |
| D．had been disappeared |
—Have you finished the book? —No. I've read up to __________ the children discover the secret cave.
| A．which | B．what | C．that | D．where |
When I opened the door, I found my father sitting in his chair, completely __________ in the humorous stories he was reading.
| A．absorbed | B．losing | C．attracted | D．addicted |
Before __________him, Icalled him __________.
| A．visiting；in advance |
| B．visit；in advance |
| C．visiting ； advance |
| D．visit； advance |
In the past 100 years many species, as a result of human destruction to nature，__________ and many more __________ now.
| A．have disappeared； are disappearing |
| B．disappeared；are disappearing |
| C．have disappeared；disappear |
| D．are disappearing；disappear |