用所给词的适当形式填空.
1、YesterdayIwasverybusy.I_____(work)onthefarmaiiday.
2、Theboy_____(walk)inthestreetwhenhesawtheforeignergettingout.
3、Mother____(cook)whilefather______(wash)hiscarthismorning.
4、Whentheman____(visit)themuseum,hefriends____(see)him.
5、Afterawhile,theboy___(go)onplayingcomputergames.