1.It took Jack two hours to climb the mountain.2.The tomatoes I picked are much redder than yours.3.They didin't have the chance to go there two montbs ago. 4.Although he is old, my grandpa works on the farm.5.You are terribly ill. You'd better be in bed.6.The nearest village is about one hundred miles far from here.7.I don't like going out alone after dark.8.I'm looking forward to receiving her letter. 9.Birds flew back because of the fine environment.10.The students entered the classroom one by one.我改的不一定,还请高手进一步改正.....