【正文】
. So more trees ____ . A. must plant B. must be plant C. must be planted ( ) 8. Manmade satellites ___ into space by many countries since 1960. A. have sent up B. have been sent up C. has been send up ( ) 9. ___ the homework ____ the day after tomorrow? A. May, be handed inB. Maybe, handed inC. May, hand in ( ) 10. My father _____ not to smoke any more. A. told B. is told C. are told A C B A B : 1. She often cleans the house. The house ____________ by her. is often cleaned are planted am/is/are+動詞的過去分詞 plant trees in spring every year. Trees _________ by us in spring every year. : 1. They built the house last year. The house _________last year. was built were taken was/were+動詞的