1.I saw ( )accident yesterday .
2.She goes to the library on ( )foot .
3. I have ( )envelope , but I haven't got ( )stamp .
4.Could you switch off ( )TV ?Nobody is watching it .
5.There is ( )post office in West Street .
6.Mary listens to ( )radio every night .
7.Dolphins are ( )intelligent animals .
8.He went to ( )bed at nine o'clock last night .
更新1:
9.Dolphins are ( )intelligent animals . 10.He went to ( )bed at nine o'clock last night . 11.Mr.Wong was sent to ( )hospital .
