—Has William finished writing his graduation paper yet?—I don’t know exactly,but he __________all day.
Amy eats lots of fruit and vegetables, _______ are good for her health.
---Have the papers been graded? --- Yes, but I regret that you failed it.
My cousin is a person __________ I can discuss my problems.
. Nowadays online games _______ teenagers.
---What do you ______ the waste bottles? ---We can sell them instead of throwing them away.