30. It was once called the Sea of Bamboo, but now only one fifth of the area ______ covered with bamboo, and sixty percent of other plants ______ taken the place of the bamboo.
| A．are; have | B．is; has | C．is; have | D．are; has |
1 haven't got a single ______from Aunt Mary since I last saw her.
| A．advice | B．news | C．message | D．information |
The rescue team ______to help but failed to get there in time.
| A．had wanted | B．have planned | C．were expecting | D．hoped |
--Will you two go to the show tomorrow?
---No. We're going to a lecture, or at least I'm planning ____.
| A．it | B．to | C．that | D．so |
I'd love ___ to your party last Sunday if not because of the unexpected guests.
| A．to go | B．going | C．having gone | D．to have gone |
.____ the temperature falling so rapidly, we couldn't go on with the experience.
| A．Since | B．With | C．As | D．For |