下列各句的A、B、C、D中有一处错误，请在不改变句子意思的前提下，将正确答案写在题后的横线上。

1. Please tell him don't to be late for school. 1. _______

          A               B           C             D

2. Kitty's uncle has gone to Beijing twice. 2. _______

       A                     B    C              D

3. We don't know what to solve these problems. 3. _______

                 A          B        C                   D

4. It's very nice for you to bring me the newspapers and magazines. 4. _______

                        A             B                       C                     D

5. The scientists are wondering whether can people grow plants on Mars. 5. _______

                A                  B                           C                             D