Bài 2: Choose the best option in the bracket to complete the sentences.

1. Yesterday I (must/ mustn't/ had to) finish my English project.

2. He will (must/ have to/ has to) wait in line like everyone else.

3. We (must be/ mustn't / have to) on time for work.

4. We (have to not/ must/ mustn't) forget to take the chicken out of the freezer.

5. If you are under 15, you (have/ must/ mustn't) to get your parents' permission.

6. Your child may (have to/ had to/ must) try on a few different sizes.

7. The doctor (must/ mustn't/ have to) get here as soon as he can.

8. Do you (have to/ must/ mustn't) work next weekend?

9. Bicyclists (mustn't/ must/ has to) remember to signal when they turn.

10. Susan, you (mustn't/ must/ have to) leave your clothes all over the floor like this.

Bài 1: Choose the correct answer to complete the sentence.

1: I ................... go to the hospital. I want to meet my old friend for the last time.

A. Have to            B. Has to              C. Must                D. Must to

2: I ................... go to the hospital. I have a meeting with my doctor.

A. Have to            B. Has to               C. Must                D. Must to

3: She ................... get up ealy on Monday. She want to do a lot of thing on this day.

A. Have to            B. Has to               C. Must                D. Must to

4: She ................. get up early on Monday. She will have an important meeting on this day.

A. Have to            B. Has to               C. Must                D. Must to

5: I haven’t phoned my mom for a month. I ................... phone her right after I’ve finished my job.

A. Have to            B. Has to               C. Must                D. Must to

tham khảo 

Cơm chứa một lư­ợng lớn tinh bột, khi ăn cơm trong tuyến n­ước bọt của ngư­ời có các enzim. Khi nhai kỹ trộn đều, tuyến n­ước bọt làm tăng cơ hội chuyển hoá một lượng tinh bột theo phản ứng thuỷ phân thành mantozơ, glucozơ gây ngọt.

giúp mình bài 16,17,18 <33

x+1phần x -3  -   1-x phần x +3   -   2x(1-x) phần 9-x²