–Zheng Zhou has changed a lot in the past few years.--Yes. You can see a lot of buildings, trees on ___ sides of the streets.
It’s more than 8 years since I a teacher.
Tom will be old enough ________ to school this year.
– Where is your mother? -- She ________ to shanghai. She has ever ________ there twice.
________ have you been in this city? -- Ever since 2000.
It is ________ of people to help the disabled.