Keep the camera ________ when you take a picture.
The good thing about children is that they __________ very easily to the new environment.
In my opinion, to eat more vegetables and play some sports is __________ to our health.
—Will Thursday or Friday __________ you?—Either will __________
Experiments of this kind __________ in both the U. S. and Europe well before the Second World War.
It's no use __________ without taking action.