1. I would do anything for you There's  2. Yogurt is supposed to be good for you Yogurt is supposed to do. 3. Is it essential to meet your aunt at the station? Does your aunt  4. Even though I admire his courage, I think he is foolish Much. 5. Given fair warning, I could have avoided that date If you had told me 6. Please don't say things like that I wish 7. It would have been a superb weekend if it hadn't been for the weather But  8. Dogs can swim better that cats can Cats cannot 9. She hasn't been to the hairdresser for three months It's  10. There's a spare bed in David's room David's room.

Phương pháp làm cho câu hỏi này là điền vào chỗ trống các từ hoặc cụm từ thích hợp để hoàn thành câu.

1. I would do anything for you
There's nothing I wouldn't do for you.

2. Yogurt is supposed to be good for you
Yogurt is supposed to do wonders for your health.

3. Is it essential to meet your aunt at the station?
Does your aunt have to be met at the station?

4. Even though I admire his courage, I think he is foolish
Much as I admire his courage, I think he is foolish.

5. Given fair warning, I could have avoided that date
If you had told me in advance, I could have avoided that date.

6. Please don't say things like that
I wish you wouldn't say things like that.

7. It would have been a superb weekend if it hadn't been for the weather
But for the weather, it would have been a superb weekend.

8. Dogs can swim better that cats can
Cats cannot swim as well as dogs can.

9. She hasn't been to the hairdresser for three months
It's been three months since she last went to the hairdresser.

10. There's a spare bed in David's room
David's room has a spare bed.

2. Yogurt is believed to have various health benefits.

2. Yogurt is supposed to do wonders for your health.

Phương pháp giải phương trình trên là sử dụng công thức nghiệm của phương trình bậc hai, trong đó:
- Nếu delta (Δ) = b² - 4ac < 0, thì phương trình vô nghiệm.
- Nếu Δ = 0, thì phương trình có nghiệm kép x = -b/2a.
- Nếu Δ > 0, thì phương trình có hai nghiệm phân biệt x₁ = (-b + √Δ)/(2a) và x₂ = (-b - √Δ)/(2a).

Áp dụng công thức trên vào phương trình x² + 2x + 3 = 0, ta có:
a = 1, b = 2, c = 3.
Δ = 2² - 4 * 1 * 3 = 4 - 12 = -8.

Vì Δ < 0, nên phương trình x² + 2x + 3 = 0 không có nghiệm.