A. teach

B. meat

C. disappear

D. feature

Xà phòng hóa hoàn toàn 17,8 gam tristearin trong dung dịch KOH, thu được m gam kali stearat. Giá trị của m là 

A. 20,08

B. 18,36

C. 21,16

D. 19,32

X là 1 aminoaxit no mạch hở có 1 nhóm –COOH và 1 nhóm –NH₂. Y là este của X với ancol etylic. M_Y = 1,3146M_X. Cho hỗn hợp Z gồm X và Y có cùng số mol tác dụng với dung dịch NaOH vừa đủ đun nóng thu được dung dịch chứa 26,64 gam muối. Khối lượng hỗn hợp Z đã dùng là:

A. 24,72 gam 

B. 28,08 gam 

C. 26,50 gam

D. 21,36 gam 

Choose the correct option for each gap in the sentences :

1.Linh used to .................... jigsaw puzzles in his free time ( do / does / doing / did )

2. My mum ....................... the bus to work every morning, but David drivers ( catches / goes / does / runs )

3. Traffic accidents can be prevented if people ......................... the rules ( remember / obey / go after / take care of )

4. You should look right and left when you go ....................... the road ( along / up / down / across )

5. Hurry up, or we'll ....................... the last bus ( lose / avoid / miss / drop )

6. Before the new system of traffic control, there ..................... be more accidents ( use to / used to / is used to / get used to )

7. Public ........................ in this city is quite good,and it's not expensive ( journey / travel / vehicle / transport )

8. ........................ isn't very far from here to the harbour ( there / this / it / that )

9. Did you read that ..................... of the Chainsaw Massacre at Halloween ? It said that the films was so gripping ( review / report / summary )

10. Vanilla Sky ...................... Tom Cruise, Pénelope Cruz and cameron Diaz ( acts / plays / stars )

11. I like the film very much ! The characters are unforgettable and the ..................... is gripping ( plot / style/ acting)

12. The film was so boring ......................., Jack saw it from the beginning to the end ( Therefore / However / Although )

13. In spite of having a happy ......................., the film begins with a terrible disaster ( ending / acting / setting )

14. I'm sure you will find the film ....................... ( amuse / amused / amusing )

15. Avatar is a 3D hit- the special ........................ are amazing ( effects / scenes / staegs )

16 " Do you feel like seeing a film ? " - ........................ ( No, I don't like it all / Sure what film shall we see / Who is in it ? )

17. If you want to know which films are on at the cinemas, you should look at the film ...................... this newspaper ( section / review / report )

18. It stars Marlon Brandon as the Godfather. He won an Oscar for his ......................... as the boss ( action / performance / direction )

19. Does your bike ever ........................ down on the way to school ? ( break / take / do / turn )

20. I ........................ go on foot when I was in primary school ( have to / can / may /used to )

21. Give a ........................ before turnm left on right ( sign / turn / sound / signal )

22. A lot of dancers go to Rio de Janeiro to .......................... the Rio Carnival ( join / perform / attend / appear )

23. I had to stand in the balcony to catch the whole ........................ off the parade ( view / picture / sight / vision )

24. Everybody attends the festival ..................... fun ( with / for / in / at )

25. On Thanksgiving, families and friends ........................ to have feast ( meet / arrive/ gather / appear )

26. The ending of the film was so ......................... ( moved / moving / move/ moveable )

27. Although they spent a lot of money on the film, it wasn't a big ........................ ( success / failure / performance / show )

28. ......................... the film was gripping, Tom slept from the beginning to the end ( However / Although / In spite of / Despite )

Cho các phân tử: (1) glucozơ, (2) saccarozơ, (3) amilozơ, (4) amilopectin, (5) xenlulozơ. Số phân tử có thể tham gia phản ứng thủy phân để phá vỡ liên kết glicozit là

A. 5.

B. 2.

C. 4.

D. 3.