单选题 We couldn't buy anything because________of the shops were open. ( 1.5 分)

单选题 She is not only my classmate_______also my good friend. (1.5 分)

单选题 We have friends to help us fight against pollution, and trees are one of________. ( 1.5 分)

单选题 These light bulbs look the same, but their______on the environment are different. ( 1.5 分)

单选题 Mum always tells me "A smile costs_______,but gives much." (1.5 分)

单选题 —How much did you____the two books?
—More than forty dollars. ( 1.5 分)

单选题 When he entered college, he began to learn______ language (1.5 分)

单选题 I forgot to return the book to you yesterday, so I_______today. (1.5 分)