______ the house price is declining, many people are considering buying houses ss.
| A．While | B．As | C．If | D．Unle |
-- Could you be so kind as to close the window?
-----__________________.
| A．With pleasure | B．Go ahead | C．Yes, please | D．That's OK |
Just as Professor Scotti often______ it, success is ninety-nine percent mental attitude.
| A．gets | B．makes | C．puts | D．means |
-- 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 |
- I wonder how much you charge for your services.
-- The first two are freethe third costs $30.
| A． | while | B． | until | C． | when | D． | before |
We can never expect____ bluer sky unless we create_____less polluted world.（）
| A． | a; a | B． | a; the |
| C． | the; a | D． | the; the |