Many a professor _____ looking forward to visiting Germany now. Many scientists _____ studied animals and plants in the last two years.
| A．is; have | B．is; has | C．are; have | D．is; are |
He is very sick. I insist that a doctor __________ immediately.
| A．has been sent for | B．sends for | C．will be sent for | D．be sent for |
In the novel, the two cities referred to __________ London and Paris.
| A．be | B．being | C．are | D．was |
All the task __________ ahead of time, so they decided to go on holiday for a week.
| A．having finished | B．had finished | C．having been finished | D．had been finished |
—I didn’t know this was a one-way street, officer.
—________.
| A．That’s all right. | B．I don’t believe you. |
| C．How can you say that? | D．Sorry, but that’s no excuse. |
It seems that living green is __________ easy and affordable. A small step makes a big difference.
| A．exactly | B．fortunately | C．surprisingly | D．hardly |