17. This person is short and thin. She has…………….. hair. (a long black/ black long/ black short/long black) 18. They have studied ______ three hours. (for / at / since / to) 19. He does morning exercises regularly in order to ______ his health. (have / improve / get / take) 20. Don’t let your child ______ with matches. (playing / to play / plays / play) 21. They ______ from Canada to America to find work. (started / demonstrated / delivered / migrated) 22. Last night I watched the movie Romeo and Juliet. At last they killed ______. (together/ each other/ themselves / one another) 23. My mother is ______ tired ______ cook tonight. (enough – to / too – to / so – that / very – to) 24. He went to school late because he was stuck in the ______ this morning.(rush-hour / traffic-light / traffic-jam / cross-road) 25. Airmail is ______ expensive than surface mail. (the most / most / much / more) 27. Ho Chi Minh Communist Youth Union is an ………….for Vietnamese teenagers. (organizational/ organizationally/ organization/ organizatic) 28. John came ______ an old school friend in the street this morning. (with / along / across / off) 29. She asked her children ______ (to stop playing / stop to play / stop playing / stopping to play) 30. He is not ______ ride a motorbike. (enough old to / enough old for / old enough to / old enough for) Giúp vs ạ