Scientists are confident that they can make lasers which can ____ missiles.
| A．knock down | B．knock out | C．knock into | D．knock off |
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 |
He started to explain， but she cut him short，_____ she had to catch a bus.
| A．saying | B．said | C．to say | D．having said |