一 单项选择。(25分)
( ）1、Trees and flowers _____ every year to make our country more beautiful.
A. is planted B. was planted C. are planted D. were planted
( ) 2. The tel ephone _____ before the TV.
A. invented B. is inventing C. is invented D. was invented
( ) 3. –What did Miss Chen say to you just now?
--She said that all the books should ___ to the library.
A. are returned B. return C. be returned D. be returning
( ) 4. --- _______ were personal computers invented?
---- In 1976.
A. What B. How C. Who D. When
