V. Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.

1. The worst detrimental effect of global warming is the rise on sea levels worldwide.

     A                         B                                                              C           D

2. Having cycled to work every day, I become more responsibly for the environmental issues.

              A                               B                                    C                                              D

3. Having been watched TV programmes about the farmers' careless use of chemical fertilisers on their

                A                                           B                                                                                   C

crops, many citizen dwellers decided to grow their own vegetables.

                                                           D

4. Having suffered water shortage in the past, we are all very economic on using water.

                   A                                          B                                   C                 D

5. Minh’s sister graduated from university last month and has looked for a job.

      A                        B                                                               C                D

6. Most of the courses are now credit-based, which brings more flexible in the programme schedule.

      A                                                 B                              C                D