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spent were spending had spent could spend
to praise and encourage their children more often to be hard on their children to leave their children alone with nothing to do to give their children as much help as possible
spent being spent to spend was spent
were spending spent are spending have spent
into children's hats into children's stocking under children's beds into children's shoes
180～200℃，8～lO分钟 250～260℃，10～15分钟 150～170℃，15～20分钟 200～220℃，5～6分钟 230～240℃，3～4分钟
spent being spent to spend was spent
the telephone company cut all the telephone lines the police stored false information in Stoll' s computer system Stoll told the police everything he knew Stoll spent lots of time and efforts
ε＝（Lt－Lo）/（Lo－Ld） ε＝（Lt－Lo）/（Lo－2Ld） ε＝（Lt－Lo）/（Lo－3Ld） ε＝（Lt－Lo）/（Lo－4Ld）
R1->LO R3->LO R1->T3->LO R3->T3->LO
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