We had planned to finish the work before dark, but we were by a heavy rain. [ ]

Where are you going, Bob—To go hiking. Eric _____for me at the school gate!

The workers recycle the old newspapers ______use them．

When your mom is busy and tired, you should to help around the house.

While I admit that English words keep escaping from our memory, constant ______ to them not only increases our understanding of them, but likely plants them into our mind.