10. The underground is cheap; _______, it’s faster than the train.A. nonethelessB. furthermoreC. thereforeD. and11. You can come here either on Monday _______ Thursday.A. orB. besidesC. soD. but12. Nam had a terrible headache. _______, he still went to work.A. NeverthelessB. OrC. ThereforeD. But 8. Câu ghép và câu phức