用be动词的正确形式填空。 1.I________a boy. Li Lei________a boy, too. 2. —What________your phone number? —It________905-7447. 3. --Excuse me.________you Mark Brown? Yes, I________Mark Brown. 4. —Excuse me, Jenny.________that your pencil case? —No, it________not. It________his pencil case. 5. —Jack________in China. —Yes, Jim and Kate________in China, too.