A car engine cannot run smoothly without motor oil.____ our body cannot function efficiently without vitamins.

--People should use public transport instead of their own private cars.--- _______.The roads are too crowded as it is.

As a typist, the most important aspect of the job is to be able to type quickly and _____.

Although the old man was ____ , but he didn’t feel ______. He had a dog as a company.

It rained that day and ___ the baseball game was called off.