There is one mistake in each sentence. Find out and correct it

1. As soon as he will come back from his office, tell him to see me.

                                   A                   B                     C               D

2. He regretted not  say goodbye to his girlfriend at the airport.

                           A    B                  C                       D

3. The storm we visited was  a four –days journey from our hotel, so we took the train

                                        A                     B                                                   C

instead of the bus.

                     D

4. Our new neighbours had been living in Paris since ten years before moving to their

           A                                       B                         C                             D

present house.

5. The explanation that our teacher gave us was difficult than the one you gave us.

                                        A                 B                    C                                  D