九（上）U4T1SA 限时训练
一.变被动语态：
1.Now people can use computers to help them.
Now computers ______ ______ _____to help them
2. Did you plant many trees at this time last year?
______ many trees___ _______ at this time last time?
3.Must we finish our work today?
______ our work ____ ____ today?
4.The foreign friends gave us some wonderful stamps.
1)___ ___ ____ some wonderful stamps.
2) Some wonderful stamps ___ ____ ___ __
5.The teacher asked Tom to turn on the computer.
Tom ____ ___ to turn on the computer.
