Du Vigneaud , a well-known American scientist, the Nobel Prizechemistry in 1955.
A man does not know the difficulty of anything_________ he does it personally.
There is a _________ of 1000 dollars for the return
Isn't it very kind __________ your parents to do that for us? A. for B to C. about D. of
I caught the last bus from town, but Harry came home___________ that night.
We will take________ wants to go there for a sight - seeing.