46.They believe that the robbers got into the bank through the roof.(ARE)

he robbers are believed to have got into the bank through the roof

47.Only if you work hard now have you any chance of success.
-->Your chance of success depends on your working hard.
48.Can you tell me where the Midland Hotel is?(DERECT)
Can you direct me to the Midland Hotel ?
49.You won't find out wherther they are open if you don't phone them.(WITHOUT)
You won't find out whether they are open without phoning them
50.The competition will take place on Sunny , rain or shine.(WHETHER)
The competition will take place on Sunny whether it rains or not