Volunteering is becoming _____ popular in China — That’s true People are now aware that helping others is helping themselves [ ]

Some forms of algae have to growing on ice.

It’s __________ to our health if we often stay up late .— Yes, and one day we will regret doing so .

If we don’t study hard, we will___________ in our class.

Mary hasn’t paid for the school things, has she –______. Her mother will pay for her.