1, Those drivers ( drive ) .............for three hours when a heavy storm suddenly ( break) ..........
2, People ( not send ) .......................snail mail any more in 2040
3, They ( use ) ..............signs to communicate with each other at this time yesterday
4, If teachers ( integrate ) .........practical applications of science and technology into their lessons, students ( be ) .......... interested in the subject
5, By 2030 , secondary students ( not go ) .............to school every day , but ( have ) ............ some online lessons instead
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