They ________ to enter the building by the back door; however, the front door was locked

_____ all the inventions have in common is ______ they have succeeded.

The bike-sharing schemes are aimed to __________ citizens to choose a healthy and green approach to solving the lack of public transportation.

If we __________enough rain last year, we___________a good harvest this year.[ ]

Tim is in good shape physically _____he doesn’t get much exercise.[ ]