This machine, ______for many years, is still working perfect..
This machine, ______for many years, is still working perfectly. A.after which I have lookedB.which I have looked after C.that I have looked after D.I have looked after
The reason__________ their failure you know is _____they did..
The reason__________ their failure you know is _____they didn't get fully prepared for the experiment.A.why.., thatB.that.., whyC.for.., thatD.why.., because