11. I'm afraid I .................... able to attend your workshop tomorrow. A. isn't B. won't be C. wasn't D. weren't

1. A .................. is a device that converts sunlight into electricity. A. solar panel B. solar energy C. solar system D. solar power

5. People often think Santa Claus and pine trees are the .................... of Christmas. A. symbols B. performance C. parade D. decorations

9. Not many people went to see the film; ...................., it received good reviews from critics. A. but B. because C. however D. although

8. You .................... not cross the road when the trafic light is red. It's dangerous. A. must B. can't C. shouldn't D. should

4. At the moment, scientists ................ to generate electricity from alternative energy sources with the lowest cost. A. are trying B. is trying C. will try

2. Which ............... of transport do you think will be used in the future? A. mean B. means C. meaning D. meanings

7. While I .................... my homework, my sister .................... newspapers. A. are doing/ is reading B. am doing/ are reading C. is doing/ are reading D. am doing/ is reading

6. "Why is it called a .................... source?" - "Because it can be replaced easily and quickly." A. non-renewable B. effective C. renewable D. specific

3. The future vehicles may run faster, cost cheaper and be more .................. A. economy B. economical C. economic D. econimically

14. Yesterday, Tom .................. his finger when he sliced the bread. He lost a lot of blood. A. cuffed B. didn't cut C. was cutting D. cut

16. When the energy comes from water, we call it .................. energy A. solar B. hydro C. natural D. wave