I still remember the name of the village＿＿＿＿we visited last year. 

---_______ one and a half months enough for the project to be finished?　　---I am afraid not. The professor is ill and only after he recovers ________ go on with it.

 Only when class began _______that he had left his book at home.

I tried every means to reach my goal but failed. So desperate ______ that I almost lost heart.

If _____ without following the doctor’s instructions, the medicine may have serious side effects.