---What _____ heavy rain it was!
---Yes, but I love _____ air after it rains. It smells so fresh.
| A．the, a | B．a, the | C．the, the | D．a, a |
The new treatments ________by Norman Bethune helped a number of soldiers.
| A．invent | B．invents |
| C．inventing | D．invented |
If prices rise too high, the government has to do something ________it.
| A．stop | B．stopped |
| C．stopping | D．to stop |
At last the boy was made ________and began to laugh.
| A．stop crying | B．to stop to cry |
| C．to stop crying | D．stop to cry |
—Don't forget ________your homework，John.
—OK.I'll do right now.
A．doing B．do C．to do
Plan your time carefully and make sure you have some time ____what you like every day.
| A．do | B．to do |
| C．doing | D．done |