I should not have laughed if I ______ you were serious.

I        to my cousin’s birthday party last night, but I was not available

If we    a table earlier, we couldn’t be standing here in a queue.

Don’t turn off the computer before closing all programs     you could have problems

Since nobody gave him any help, he    have done the research on his own.

The rule demands that everyone ______ quiet in the school library.

––What a journey! We’ve finally arrived!––_____ an out-of-date train schedule, we would not have missed the train.

— It’s raining heavily and we can’t go climbing today.— If only the weather _______ fine.

---Why didn’t you reared him of the possible danger?---But what       otherwise? He never listens to me.

 If we had become aware of danger earlier, we _____ to stay in that temporary shelter.

—It has been nation-widely required that every student ______ have daily exercise for one hour.—Yeah.It is high time that we ______ special attention to physical exercise.

---“Why do you have to be there at six?”---“The teacher demands that everyone _____in his seat at six.”

If you had arrived half an hour earlier, you _____ the well-known writer in the flesh.

The order came that the medical supplies ______ to the village without delay.

Had I known her name，I________.

 Look at the trouble I am in! If only I          your advice!

The teacher demanded all the exercise books ______ the next day.

--- Did they attend the opening ceremony? ---They        _, but they were late and quit it.

---Ann looks hot and dry.---So _______ you if you had a high fever.

 If it ____for the snow, we____ the mountain yesterday.