摘要：
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The flu is believed________ by viruses that like to reproduce in the cells inside the human nose and throat．
- A.causing
- B.being caused
- C.to be caused
- D.to have caused
________the old man got on the bus．
- A.Supporting the young man
- B.Supported by the young man
- C.Being supported by the young man
- D.To support the young man
______the extremely hot weather, we continued having classes．
- A.Thanks to
- B.In addition to
- C.In defence of
- D.Regardless of