We all know that, __________, the situation will get worse.
| A．not if dealt carefully with |
| B．if not carefully dealt with |
| C．if dealt not carefully with |
| D．not if carefully dealt with |
She said she was sorry _____ the train, so she had to stay here for another day.
| A．missing | B．having missed | C．to miss | D．to have missed |
Although swimming is his favorite sport, yet he doesn't like _____ today.
| A．to swim | B．swimming | C．swim | D．to have swim |
Saying always has less difficulty than _____.
| A．done | B．doing | C．to do | D．having done |
_____ his homework, he went out to play.
| A．Having done | B．Done | C．He has done | D．He had done |
_____ from the top of the hill, the lake is just like a mirror.
| A．Having seen | B．Seen | C．To see | D．Seeing |