The shocking news made me realize      terrible problems we would face.

I can’t  tell you the exact time when I will get there, maybe at eight or at nine or still later._______, I’ll be  there as early as I can.

Scientists say it may be five years ______ it is possible to test this medicine on human patients．

Remember that you won't be able to cancel the contract ____you've signed. 

_____ I am concerned, Peru is well worth a visit.