1. They will construct some new airports on islands.

=> Some new airports on islands will be constructed.

2. The new president might fulfill this promise as quickly as people would like.

=>This promise might be fulfilled by the new president as quickly as …

3.They are going to find out the mystery.

=> This mystery is going to be found out.

4. You can buy videos like this one anywhere.

=> Videos like one can be bought anywhere.

5. Someone will tell you when you go in to see the doctor.

=> You will be told when …