4. "I have been to Singapore _____. How about you?" A. two B. two times C. twice D. twice times 5. _____ doing morning exercises is good for your health, don't do it too hard. A. Although B. If C. But D. When 6. I have been _____ many beautiful places in Viet Nam. A. at B. on C. in D. To 7. I first _____ to Ha Noi in 2010. A. was B. went C. have been D. have gone 8. "I'd like to change the _____ . Please give me the remote control." A. programme B. view C. channel D. television