ys, a lot of children have less time to play andcommunicate with their peer due to extra studies. ________, it is difficult todevelop their character and social skills.

There are ________ bears on the earth because they have ____________ space on it．

My father and his teacher talked for about an hour of things and persons ______ they remembered at the school

You will find what great benefit the computer you own can be________each time you use it to help you work.[ ]

Not until the early years of the 19thcentury______ what heat is