It means, for example if I say, "I go to the park every now and then", then it isn't a common event, but happens often enough not to be classified as a rarity.
Answer:
a ballooon filled with helium if sealed properly
Explanation:
balloons filled with helium will get stuck in the atmosphere
Answer:
If that is your answer on the top, select all of them
Explanation:
I just always select all after writing sm and getting it right :)
I think this might help you figure out the theme, hope this helps