15 ____Are you pleased with theperformance—– Not at all It couldn’t havebeen_____

Though he doesn’t achieve his goals, he is not a failure．___, he is remembered as a true hero．

Jack likes many subjects, ________ maths, history, English and so on.

The study of natural history is not something to be left to biologistsIn fact, their capacity _________ the time they can spend away from their offices is very limited

Who is it up _____ decide whether to go or not?