__________ people in the world are sending information by E-mail every day.
| A．Tens of thousands of | B．Ten thousands of | C．Several millions | D．Many million |
___________in the study lost in thought for a long time, I suddenly realized that nothing in the world remains __________.
| A．Having sit; unchanged | B．To sit; unchanging |
| C．Sitting; unchanged | D．Sitting; unchanging |
In the thrilling activity of bungee jumping, ________most matters is courage rather than strength.
| A．it | B．that | C．as | D．what |
Mary felt ______from the outside world, since she lacked an Internet connection and couldn’t receive any e-mail.
| A．cut down | B．cut in | C．cut off | D．cut out |
—Do you ______ the idea of living a low-carbon life?
—It sounds tough, but it is a tendency.
| A．adjust to | B．apply to | C．approve to | D．subscribe to |
— When shall we go planting trees in the hill?
—______ it begins to rain, so they don’t need watering.
| A．Not until | B．While | C．Till | D．Unless |