It was Tom as well as his friends that ________ for the serious accident.
| A．was to be blamed | B．were to blame | C．was blaming | D．was to blame |
—Hey , Mr．Smith , you are wanted on __________phone ．
—Who is calling ?
—___________Mr．Green ．I don’t know he is ．
| A．不填；A | B．the ；不填 | C．the ; A | D．不填；不填 |
_____, he always tries his best to complete it on time.
| A．However the task is hard | B．However hard the task is |
| C．Though hard the task is | D．Though hard is the task |
Scientific research results can now be quickly_____ to factory production.
| A．used | B．applied | C．tried | D．practiced |
After _____ seemed an endless wait, it was her turn to enter the personnel manager’s office.
| A．that | B．what | C．which | D．whether |
_____ at in this way, the present economic situation doesn't seem so gloomy.
| A．Looking | B．Looked | C．Having looked | D．To look |