1. (-) He hasn't lived here for three years
    (?) Has he lived here for three years?
2. (+) We have been here for two weeks.
    (?) Have they been here for two weeks?
3. (+) They have missed the train.
    (-) They haven't missed the train.
4. (-) I haven't had breakfast this morning.
    (?) Have you had breakfast this morning?
5. (+) She has passed the exam.
    (?) Has she passed the exam?
6. (+) I have met his mother.
    (-) I haven't met his mother
7. (-) We haven't eaten too much chocolate.
    (?) Have they eaten too much chocolate?
8. (+) I have known David for ten years.
    (?) Have you known David for ten years?
9. (+) She has read the book.
    (-) She hasn't read the book? 

1350 cm²
 

B

Chu vi hình tròn là: 
 1,2 x 3,14 = 3,768 (m)
Bán kính hình tròn là:
 1,2 : 2 = 0,6 (m)
Diện tích hình tròn là:
 0,6 x 0,6 x 3,14 = 1,1304 (m²)
               Đáp số : 3,768 m ; 1,1304 m²

Đáy bé của hình thang là:
 50 x \(\dfrac{4}{5}\) = 40 (dm)
Chiều cao của hình thang là:
 40 : 100 x 75 = 30 (dm)
Diện tích hình thang là:
 (50 + 40) x 30 : 2 = 1350 (dm²)
                Đáp sô : 1350 dm²

1. What do they always have on Thanksgiving? 
2. When did his father come back from Hanoi?

1. How much water do you drink every day?
2. I eat two bowls of rice every day.