1. You ought to look _____ your little brother instead of playing around. A. at B. up C. after D. into 2. Remember to turn _____ the faucet when you don’t use it, Lan. A. on B. of C. up D. off 3. Tom’s hobbies are swimming _____ collecting stamps. A. or B. but C. so D. and 4. She’s very tired. _____, she has to finish her homework. A. Moreover B. So C. Because D. However 5. Is he an actor _____ a singer? – An actor. A. and B. or C. with D. so 6. He was tired, _____ he took a rest before continuing the work. A. so B. and C. but D. because 7. We want to use solar energy, _____ it can not be used on cloudy days. A. but B. so C. because D. however 8. If we _____ talking, we’ll be punished. A. look after B. go on C. turn on D. look for 9. She didn’t study hard. _____, she failed the test. A. Because B. Since C. Therefore D. However 10. The air is polluted _____ there is too much traffic. A. however B. because C. therefore D. but