the dog,if----properly,-----a good hunting dog.

the dog,if____properly,_____a good hunting dog.
a.had been trained...would have been made
b.trained...will make
to master a foreign language like english requires hard work,so you ___study too hard.
a.can't
b.ought to
c.should
d.musn't
我表示根本看不懂
-did tom join you?\
-no,_____,but he happened to have fallen ill
a.would like to
b.was to
A不可以么?