(3) A: Andy, you ( ) for three hours now. I think it's time to stop and
take a break.
B: OK, Mom. Just another ten minutes.
1 studied
3 have been studying
2 to study
4 were studying
(4) When Mark arrived at school this morning, he noticed that he had
not (
) his lunch box.
1 bring
102 bringing
3 to bring
4 brought
IWO