While they were playing, a bomb _____ on the Bay Bridge, and one boy was injured seriously.
| A．explored |
| B．fought |
| C．exploded |
| D．happened |
I can make myself _____ in French， but I’m not fluent.
| A．understood | B．understand |
| C．to understand | D．being understood |
The trip cost a total of 250 dollars， insurance _____.
| A．including | B．included | C．to include | D．being included |
The waiter greeted me with a big smile and _____ us by the window.
| A．seating | B．seated | C．to seat | D．being seated |
She was staring out over the lake，_____ in thought.
| A．lost | B．losing | C．to lose | D．to having lost |
It can be cheaper to buy a new washing machine than to get your old one _____.
| A．repaired | B．to repair | C．repairing | D．having repaired |