He failed the mid-term examination and only then _______ how much time he had wasted.
.______ to computer games, he had no time to go over his lessons. As a result, he failed in all subjects.
---- Did he give you advice on your work yesterday?---- Yes. But his advice, as a matter of fact, ______ my difficulty.
Mountain climbing ______ be really dangerous at times even though it is challenging and exciting in general.
The music, ____________ pleasant, was soon well received when it was taken to the stage.
----Did the reference give the information you needed?----Yes, but it, I had to read it entirely.