根据 课文内容,在空白处填入 1 个适当的单词或括号内单词的正确形式。 One of the most well ­ known and well ­ loved types of comedy is called stand ­ up , which 1._______ (consist) of different varieties of stand­up comedy. 2. _____has always been humor in them to make people 3. ________ (watch)them laugh. Billy Crystal , 4. famous stand­up comedian , has hosted the Academy Awards nine times.Each time , he performs his stand ­ up routine in front of millions of people 5. __________the show is broadcast live on TV.His outstanding ability 6. __________ (improvise即兴创作)has impressed people around the world. Doctors 7. _________ (discover)that people who/that laugh a lot live 8. ________ (long)after researching what effect stand­up and other forms of comedy have on us.When we laugh , our brain sends chemicals around the body that are good for us. 9. ______ (laugh)helps the body stay 10._________ (health) . As the saying goes , " Laughter is the best medicine".