___ happens, we’ll carry on the experiment.
When I was in the countryside, I would go to the river bank ____.
–Jack has won the game and he will get a reward. --He ____it. He has been training for the game for half a year!
Children under six are not _____ to school except those of extraordinary intelligence.
. Issac Newton, ____ schooling was unsuccessful, became a very famous inventor.
.He _____have solved all his probems; otherwise, he wouldn’t be so relaxed.