It is highly desirable that every effort to reuse the pollution in Beijing.
| A．is made |
| B．was made |
| C．were made |
| D．be made |
I soon found that the work I was doing had already been done by someone else. _______, I was wasting my time.
| A．In other words | B．In a word | C．As a result | D．In addition |
Many friends sent me e-mail to ________ me on the birth of my son.
| A．celebrate | B．reward | C．express | D．congratulate |
Many people ________ the accident, so it was not difficult to investigate（调查）.
| A．witnessed | B．yelled | C．annoyed | D．envied |
It was along the Mississippi River _________ Mark Twain spent much of his childhood.
| A．how | B．which | C．that | D．where |
In 1938, Hitler _________ war against Poland, which started the Second World War.
| A．declared | B．stated | C．broadcast | D．advertised |