I. 1. he failed his enghlish test, Therefore he has to do the test again

    2.She can't understand me although she is my old friend

    3.My mother didn't buy it because it was expensive

    4. Mrs Loan who works in a hospital is a doctor

II. 1.If i have enough money, i will buy that flat

     2. i'm pleased that you pass the exam

     3. This is the book which i like best.

     4. he is the most intersting boy i have ever met. 

 Nhờ bạn cho ctlhn :))

II. 1.If i have enough money, i will buy that flat

     2. i'm pleased that you pass the exam

     3. This is the book which i like best.

     4. he is the most intersting boy i have ever met.

I 

1. he failed his enghlish test, Therefore he has to do the test again

    2.She can't understand me although she is my old friend

    3.My mother didn't buy it because it was expensive

    4. Mrs Loan who works in a hospital is a doctor