_________ people begin to learn Chinese in the world.

The doctors has_________ a new idea on the treatment, which is well thought of by his companions.

I wish I _______ play tennis with my brother this afternoon, but I have to study for a test.

One witness said that he’d seen the suspect run out of the store after it___

You don’t know what great difficulty I had ________ to get the two tickets.—But the film is really worth _________ twice.