Câu hỏi:

Read the following passage and mark the letter A, B, C or D to indicate the correct word that best fits each of the numbered blanks.  

     Doing regular exercise or playing sports can be dangerous, (1) _________ if you are over 40. This is why it is a very good idea to see your doctor (2) ___________ starting if you think you are not very fit. Some people try to do exercise or play sports too vigorously too soon, and (3) ____________ they cause themselves injuries which can take a long time to heal.       However, it is not only older people who should take care. Doctors report many injuries such as backaches, sprained ankles and pulled muscles, which can all be (4) ______ if a little care is taken. If you do injure yourself, rest for a while to allow your body to recover naturally. Above all, don’t push yourself because you think it is doing you good, (5) __________, you could do yourself permanent damage.

      Doing regular exercise or playing sports can be dangerous, (1) _________ if you are over 40.