The two countries are going to meet to _______ some barriers to trade between them.

While _____ dogs, people should take care not to ____. Otherwise, they may be dangerous to others.

Could it be in the public phone box ______ you made me the call yesterday ______ you lost your IP card?

There were only two paintings for sale and he bought____.

Yesterday I witnessed ____ car hit a tree and ___driver was killed.