Many students ______ changes to show themselves in class because the class size is too big.

They often leave the boy alone at home. They think that he’s old enough to look after _____.

I don’t want to make friends with those people ______ think of themselves first when in trouble.

There is______elephant in the zoo._______elephant is from Africa.

How long have you lived ____ Jieyang?—_____ fifteen years.[ ]