He trained hard in puzzle-guessing, a sort of children’s game, all year, _____ still failed to reach his best form in all the tests given to both adults and children. 

. John hadn’t been able to quit smoking at once; he had to control his smoking desire      .

—Are you worried about the coming exam?—Only ______.

We can get a lot of useful information on the Internet; ______, the Internet also provides us with a new way of communication.

 Tom was caught cheating in an important exam. _____, he lost a golden chance of taking part in this competition.