All the photographs in this book, _______ stated otherwise, date from the 1950s.
| A．unless | B．until | C．once | D．if |
I like getting up very early in summer. The morning air is so good ______.
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |
I think your health will soon ______ if you have a holiday on the seaside.
| A．give up | B．pick up | C．take up | D．get up |
The book has been translated into thirty languages since it ______ on the market in 1973.
| A．had come | B．has come | C．came | D．comes |
---He looks very hot and dry.
--- So ________, if you had a temperature of 40℃.
| A．will you | B．you will | C．would you | D．do you |
--- How do you deal with the disagreement between the company and the customers?
--- The key ____ the problem is to meet the demand____ by the customers.
| A．to solving; making | B．to solve; making | C．to solving; made | D．to solve; made |