麻烦写下理由,

麻烦写下理由,
1.when the little girl arrived,the Browns___ supper
A.was having B.have had C.had had D.has had
2.He ___ to the lab than he set out to do the experiment.
A.has no sooner got B.no sooner got C.will no sooner get D.had no sooner got
3.I ___ to help you but couldn't get there in time
A.want B.was wanting C.had wanted D.have wanted
4.Nothing could be done to save the patient and he __ fast
A.died B.will die C.was dead D.was dying
5.don't get off the bus until it __
A.has stopped B.stopped C.will stop D.stop
6.the girl wven won't have her lunch before she __her homework
A.will finish B.finishes C.had finishes D.finished