Apart from the urgent problems _____________by wars and conflicts, the UN helps countries with other problems such as lack of education ,lack of food , poverty ,disasters and disease.
| A．to cause | B．having been caused | C．caused | D．having caused |
_______the early train,you'll have to get up early and rush in a taxi.
| A．Catching | B．Caught | C．To catch | D．Catch |
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 |