Should we start class now, or waiting for everyone to get here?

                  A                B            C                                         D

If the weather weren’t nice, we would go on a picnic.

You should run into Mark, tell him he owes me a call.

Out into the street the thieves ran.

if she bought that car now, she ran out of money.

Unless I won a huge prize in lottery, I wouldn’t give off my job.

What a pity! Had I been there on time, I would not miss the performance last night.

If I had known that the road were blocked, I would never have taken that way.

No longer does my teacher teaches in this school.

If you send the application form to our school, you would have been offered a scholarship.

            A               B                C                                                 D

Water would run downhill if there were not gravity.

If the doctors could successfully develop to the vaccine, a lot of people would be saved.

Only if everyone agreed. I would accept this position.

If Mary had been here now, she would discover the truth about your lies.

If Lucy had finished her task, she can go home.

When Linda can speak three languages whereas I can only speak Vietnamese.