He doubted, as did his family, ______________you were telling the truth.
| A．what | B．that | C．whether | D．when |
33．_________ in some rural schools that the teacher is even unable to walk through the rows of desks．
| A．The classroom is as crowded | B．So crowded is the classroom |
| C．As crowded the classroom is | D．The classroom is such crowded |
32．World leaders at the G20 summit conference in London decided to_______$1．1trillion（万亿） to supporting world economic growth and trade．
| A．collect | B．spend | C．devote | D．pay |
30．When you finish your work, don’t forget to put the tools back where they ________．
| A．are | B．will be | C．were | D．had been |
29．The police tried to get some clues from the suspect, but he remained________
| A．silent | B．quiet | C．calm | D．secret |
27．In hot weather, an old tyre can break again easily _____it’s mended．
| A．when | B．where | C．which | D．that |