Several witnesses gave accounts of what they had seen. It took many hours to _______ the court of the driver’s guilt.

It has been proved ____ several new kinds of medicine____ a positive effect on the cure of H7N9.

You can _______ and start a new life;a small step at a time and happiness will follow.

We would explain the things the children’s understanding in a simple way.

I wish to thank Professor Smith, without _______help Iwould never have got this far.