He works in a factory now, but he__ on a farm for 20 years.
| A．worked | B．has worked | C．had worked | D．had been working |
The child is much too young; I object ______ him alone at home.
| A．to leave | B．leave |
| C．leaving | D．to leaving |
We are bound ______ with difficulties in carrying out this research.
| A．to meet | B．to have met |
| C．meeting | D．having met |
________ is often the case with elder people, my grandma talked about my new hairstyle for at least 50 minutes nonstop.
| A．That | B．Which | C．As | D．It |
It is recommended that the project ________ not be started until all the preparations have been made.
| A．must | B．can | C．need | D．should |
The governor is occupied ________ the meeting at the moment. May I take a message?
| A．with | B．at | C．in | D．for |