You can change your job, you can move house, but friendship is meant to be _____ life.
| A．of |
| B．on |
| C．to |
| D．for |
__________ the employees’ working efficiency, the supervisor will allow them to have a coffee break.
| A．Improving | B．To improve |
| C．Having improved | D．Improved |
There are hundreds of visitors __________ in front of the Art Gallery to have a look at Van Gogh’s paintings.
| A．waited | B．to wait |
| C．waiting | D．wait |
The parents suggested __________ in the hotel room but their kids were anxious to camp out during the trip.
| A．sleep | B．to sleep |
| C．sleeping | D．having slept |
Mary, __________ here — everybody else, stay where you are.
| A．come | B．comes |
| C．to come | D．coming |
__________ and happy, Tony stood up and accepted the prize.
| A．Surprising | B．Surprised |
| C．Being surprised | D．To be surprising |