---What will you do if it _____ rain tomorrow? --- I’m not sure.
| A．isn’t | B．doesn’t |
| C．won’t | D．don’t |
My father likes smoking. He often says that giving up smoking is the easiest thing in the word. I know because I________ it thousands of times.
| A．have done | B．am doing |
| C．will do | D．do |
--What are you going to do tonight, Cindy?
--I’m not sure. I __________go to see a movie with my friends.
| A．must | B．should |
| C．might | D．have to |
__________ it’s very difficult, remember not to give up until the last minute.
| A．Until | B．Unless |
| C．Although | D．Since |
--Shall I close the door?
--No. Just _____it open.
| A．offer | B．try | C．push | D．leave |
__________car traffic in city centers and make the air cleaner, some countries made rules that drivers should pay extra money if they drive in the city centers.
| A．Reduce | B．Reducing |
| C．To reduce | D．Reduced |