The American people will never forget the 9.11 event and the psychological trauma __________ caused to hundreds of thousands of common households.
| A．that | B．it | C．which | D．what |
The reason ____he was late was ____he had taken a wrong bus.
| A．why; because | B．for; because of |
| C．why; that | D．for; that |
The visiting minister expressed his satisfaction with the talk, _________ that he had enjoyed his stay here.
| A．having added | B．to add | C．adding | D．added |
The Turners consider ____ a computer, which is commonly considered _________ a great help in our work and study.
| A．to buy; to be | B．buying; to be |
| C．to buy; being | D．buying; being |
To enjoy the scenery, Irene would rather spend long hours on the train ___travel by air.
| A．as | B．to | C．than | D．while |
The first satellite ____telephone signals was called Early Bird.
| A．was used to send | B．used to be sent |
| C．was used to sending | D．used to send |