Tom asked the candy makers if they could make the chocolate easier ______ into small pieces.
| A．break | B．breaking | C．broken | D．to break |
The rise of oil prices made scientists search for new energy resources ______ oil．
| A．replace | B．replacing | C．to replace | D．replaced |
You didn't believe John won the first prize at the speech competition, ______?
| A．did he | B．didn't he | C．did you | D．didn't you |
I had reached a point in my career _____ I needed to decide which way to go．
| A．why | B．which | C．when | D．where |
Here are some new computer programs _____ for home buildings．
| A．designing | B．design | C．to design | D．designed |
_______ sweet and fresh, this kind of food is so popular with local people and the tourists．
| A．Smell | B．Smelling | C．To smell | D．Smelt |