Bài 5: Thực hiện phép tính:

a) (-0,25).\(\dfrac{4}{17}\).\((-3\dfrac{5}{21})\).\((\dfrac{-7}{23})\);                    b) \((\dfrac{-2}{5})\).\(\dfrac{4}{15}\)+\((\dfrac{-3}{10})\).\(\dfrac{4}{15}\);

c) 21-3\(\dfrac{3}{4}\):\((\dfrac{3}{8}-\dfrac{1}{6})\);                                   d) \((\dfrac{-5}{6}+\dfrac{2}{5})\):\(\dfrac{3}{8}\)+\((\dfrac{4}{5}-\dfrac{11}{30})\):\(\dfrac{3}{8}\)

Bài 4: Thực hiện phép tính (hợp lí nếu có thể):

a) \((0,5-\dfrac{3}{4})\).\((\dfrac{1}{5}-0,4)\);                              b) 1\(\dfrac{1}{17}\).1\(\dfrac{1}{24}\).(-5,1);

c) \(\dfrac{5}{6}\).17\(\dfrac{1}{3}\)-\(\dfrac{5}{6}\).47\(\dfrac{1}{3}\);                                       d) \(\dfrac{11}{25}\)(-24,8)-\(\dfrac{11}{25}\).75,2.

Bài 3: Thực hiện phép tính:

a) \(\dfrac{-2}{3}\)+(-0,6)-\(\dfrac{7}{10}\);                                    b) \(\dfrac{4}{3}\)+(-1,5)+\(\dfrac{5}{12}\);

c) \(\dfrac{-5}{6}\)-1\(\dfrac{5}{7}\).\(\dfrac{-21}{15}\);                                   d) \((\dfrac{-3}{11}:\dfrac{5}{22})\).\((\dfrac{-15}{3}:\dfrac{26}{3})\).

Bài 2: Thực hiện phép tính:

a) \(\dfrac{-14}{15}\)+\(\dfrac{-4}{20}\);               b) 15+\(\dfrac{-4}{9}\);              c) \(\dfrac{-7}{8}\)-\((\dfrac{-5}{9})\);

d) 0,15:\(\dfrac{-17}{18}\);               e) 3.(-0,4);               f) \(\dfrac{-7}{8}\):\((-1\dfrac{2}{5})\).

Bài 1: Viết ba số hữu tỉ xen giữa hai số hữu tỉ \(\dfrac{-3}{5}\) và \(\dfrac{-5}{8}\).

CẤU TRÚC USED TO

1. She lived in a orphan when she was a girl.

→ She ___________________________________________________.

2. There are much more vehicles on the roads now.

→ There did not ____________________________________________.

3. We walked to work two years ago.

→ We ___________________________________________________.

4. There did not use to be so many traffic accidents before.

→ Now there are ___________________________________________.

5. There are many vehicles now.

→ There used to ___________________________________________.

Choose the word(s) that doesn't belong to the group.

1. A. donate     B. clean     C. recycle     D. blood

2. A. participate     B. children     C. volunteer     D. tutor

3. A. homeless     B. street     C. elderly     D. needy

4. A. clothes     B. books     C. poor     D. food

5. A. connect     B. charity     C. orphanage     D. organization

6. A. flowers     B. water     C. plants     D. trees

7. A. protect     B. reuse     C. exchange     D. activity

8. A. rural     B. local     C. village     D. remote

9. A. litter     B. pick     C. rubbish     D. garbage

10. A. collect     B. clothes     C. books     D. bottles

Find the word which has the different stress pattern from the others.

1. A. benefit     B. volunteer     C. primary     D. charity

2. A. mention     B. purpose     C. active     D. expect

3. A. become     B. patient     C. explain     D. protect

4. A. popular     B. hospital     C. connection     D. different

5. A. activity     B. encouragement     C. community     D. similarly

6. A. prepare     B. children     C. garden     D. homeless

7. A. reduce     B. happy     C. donate     D. around

8. A. bottle     B. playground     C. exchange     D. plastic

9. A. reuse     B. orphan     C. local     D. village

10. A. lonely     B. answer     C. future     D. connect

Bài 5: So sánh các số hữu tỉ sau:

a) -0,5 và \(\dfrac{-51}{100}\);                                       b) 1\(\dfrac{7}{9}\) và \(\dfrac{9}{5}\)

c) \(\dfrac{-295}{118}\) và \(\dfrac{-280}{133}\);                                  d) -\(\dfrac{15}{37}\) và \(\dfrac{10}{-29}\)