-Has Tommy finished his homework yet?
-I have no idea; he ____ it this morning.
| A．was doing | B．had been doing | C．has done | D．did |
After the students put up New Year decorations, the classroom ________ a holiday appearance.
| A．put on | B．turned on |
| C．took on | D．carried on |
-- What do you think of this new five-year plan?
-- We believe it will ________ the peace, stability and prosperity of our country in future.
| A．distribute to | B．refer to |
| C．subscribe to | D．contribute to |
The big fire in Shanghai, believed to ________ due to the burning of construction materials, caused 58 deaths and destroyed all the belongings of the people there.
| A．have occurred | B．occur |
| C．have been occurring | D．be occurring |
With more trees being destroyed, huge quantities of soil ________ each year.
| A．are washing away | B．is being washed away |
| C．has been washed away | D．are being washed away |
With a lot of difficult problems_________, they are working hard day and night!
| A．settling | B．to settle |
| C．being settled | D．settled |