题目内容：

语法填空

A man went to a barbershop to have his hair cut. As the barber began to work, they started chatting. They talked 1. so many things and various subjects. When they 2. (final) touched on the subject of God, the barber said：“I don't believe that God exists.”

“Why do you say that？” asked the customer.

“Well, you just have to go out in 3. street to prove that. Tell me, if God existed, would there be so many sick people? Would there be  abandoned children? If God existed, there 4. be neither suffering nor pain. I can't imagine5.(love) a God who would allow all of these things to happen.”

The customer thought for a moment, but didn't respond because he didn't want to start an 6._ (argue). After everything 7.(do) and just after he left the barber's, he saw a man in the street with long dirty hair. The customer entered the barber's again and said：“You know what？8. do not exist.”

“How can you say that？” asked the surprised barber.“I am here, and I am a barber. And I just _9._ (work) on you！”

“No！” the customer said.“Barbers don't exist because _10._ they did, there would be no people with long dirty hair, like that man outside.”