12.Doctors have been researching what effect stand-up and other forms of comedy have on　　　　　 us. You are always making the same mistakes.

11.I must have forgotten to tell you.

10.The audience have been waiting an hour for the show to star.

9.You are always making the same mistakes.

8.The students begin their training by listening to and copying traditional pieces of crosstalk.

7.People around the world enjoy watching him when he hosts the Academy Awards.

6.What they found is surprising.

5.Servant re-enters, with something behind his or her back.

4.It seems appropriate that he got his start in silent films!

3.Whatever the reason, research shows that in the end, the English saying ‘Laughter is the best medicine’ may be true after all.