You were silly not ______ your car.
| A．to lock | B．to have locked | C．locking | D．having locked |
In some parts of London, missing a bus means _______ for another hour.
| A．waiting | B．to wait | C．wait | D．to be waiting |
With a lot of difficult problems _______, the newly-elected president is having a hard time.
| A．settled | B．setting | C．to settle | D．being settled |
_______ late in the afternoon, Bob turned off the alarm.
| A．To sleep | B．Sleeping | C．Sleep | D．Having |
The picture _______ on the wall is painted by my nephew.
| A．having hung | B．hanging | C．hangs | D．being hung |
_______ the general state of his health, it may take him a while to recover from the operation.
| A．Given | B．To give | C．Giving | D．Having given |