.
The letters WHO _______ the World Health Organization.
| A．repreasented | B．meaning | C．stands for | D．stand for |
The_______waiter came up to us and said,"You are welcome."
| A．smiling | B．smiled | C．smile | D．to smile |
There is a big dog_______to a fence outside the house.
| A．tying | B．tied | C．to tie | D．ties |
Tell Mary that there's someone_______for her at the door.
| A．waiting | B．waited | C．waits | D．to wait |
Anything worth ______ is worthy of ______.
| A．doing, doing | B．doing, being done |
| C．being done, to be done | D．to be done, being done |
---Will the Smiths go abroad this summer?
---No, they finally decided _______.
| A．to | B．not going | C．not to | D．not to be going |