There is a real possibility that these animals could be frightened， a sudden loud noise．
| A．being there | B．there having been |
| C．there was | D．should there be |
31．The play_____ next month aims mainly to reflect the local culture.
| A．produced | B．being produced |
| C．to be produced | D．having been produced |
30．---- Do you think it's a good idea to make friends with your students?
---- _____ , I do. I think it's a great idea.
| A．Really | B．Obviously | C．Actually | D．Generally |
29．---- I wonder how much you charge for your services.
---- The first two are free ____ the third costs $30.
| A．while | B．until | C．when | D．Before |
28．She’ll never forget her stay there ________ she found her son who had gone missing two years before.
| A．that | B．which | C．where | D．when |
27．My uncle’s house in the downtown area is much smaller than ours , but it is twice
_______ expensive .
| A．as | B．so | C．too | D．very |