单项选择题
（），he had to leave school.
A.Sincehisfather’sunemployment B.Sincehisfatherwasunemployed C.Hisfatherwasunemployment D.Becauseofhisfatherwasunemployment
单项选择题 Certain layers of the atmosphere have special names （）.
单项选择题 Love can （） imperfection.
单项选择题 In a given month, Friday is the 21st day of the month. What day of the week was the 5th of the month? （）
