ere is less and less coal and oil,scientists are exploring new ways of making use of ______ energy, such assunlight, wind and water for power and fuel

If you have trouble pronouncing these words, you can repeat them over and over again ________ you are comfortable with them．

We don’t doubt he can do a good job.[ ]

______ wake up your sister, Ben. She needs a good sleep.

MrSmith insists on doing some running even __ a cold morning