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Cho tam giác ABC có góc A bằng 80 độ góc B bằng 40 độ tia phân giác của góc C cắt AB tại D Hãy tính số đo của góc CDA và CDB ?
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1. John managed _____ his family in England by using Zalo. A. contact B. to contact C. contacting D. to contacting 2. They advised _____ video chatting in the next meeting. A. use B. to use C. using D. will use 3. We _____ to have an Internet connection installed in our house next week. A. completed B. suggested C. admitted D. arranged 4. They _____ about video conferences at this time next Monday. A. will talk C. are talking B. will be talking D. are going to talk 5. We _____ with each other by mobile phone in 2050. A. won’t be communicating B. aren’t communicating C. haven’t communicating D. aren’t going to communicate 6. I don’t mind _____ late, if it will help at all. A. to work B. to be work C. working D. being working 7. I remember _____ to the zoo when I was a child. A. to take B. to be taken C. taking D. being taking 8. We managed _____ over the wall without A. to climb/ seeing B. climbing/ being seen C. to climb/ being seen D. to be climbed/ seeing 9. Isabel expected _____ to the university, but she wasn't. A. to admit B. to be admitted C. admitting D. being admitted 10. Let’s leave early. We can’t risk _____ in heavy traffic during rush hour. A. to hold up B. to be held up C. holding up D. being held up 11. After their children had grown up, they decided _____ to a condominium in the city A. to move B. to be moved C. moving D. being moved 12. The new students hope _____ in many of the school’s social activities. A. to include B. to be included C. including D. being included 13. Does Dr Johnson mind _____ at home if his patients need his help? A. to call B. to be called C. calling D. being called 14. Email _____ are often necessary to join social networking sites, online games, and virtual worlds. A. address B. information C. senders D. accounts 15. Email, and chat rooms let children _____ with friends and family members. A. talk B. say C. speak D. communicate 16. Skype is a voice _____ allowing users to talk to others across the world. A. hardware B. software application C. Internet access D. web browser 17. Seven of 10 people prefer face-to-face _____ when having a date. A. code B. sign C. language D. contact 18. We should not _____ passwords with anyone. A. share B. send C. bring D. lend 19. It was nice of her to let me _____ her laptop. A. borrow B. to borrow C. borrowing D. to borrowing 20. She is looking forward _____ her grandparents again soon. A. see B. to see C. seeing D. to seeing

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