---Are your parents at home, Jane?---No. They ______ taking a walk in the park.
IamnotsureifTom____home.Ifhe________, I'llcallyou.
It_______me15minutestogettoschoolonmy bike.
------Whyareyouso________? -------Iamwatchingan_______basketballmatch.
The math problem is too difficult ,I can’t__________ .
Many old men prefer __________ in a peaceful countryside.