1.By this time tomorrow I ... for three hours.
a)will flyb)will be flyingc)will have flyd)will have been flying
2.The man looked so miserable that she burst into...
a)laughingb)laughterc)cryingd)tears
3.Dave ... since he eft three days ago.
a) didn't seeb) wacn't being seenc) hasn't seend) hasn't been seen
4.she could't help ... when she saw his haircut.
a)laughtb)laughingc)laughedd)to laugh
5.she ... TV since this morning
a)watchesb)was watchingc)watchedd)has been watching