. ---You don’t seem to be quite yourself today. What’s wrong? --- Oh, I'm suffering from a cold. Nothing serious, ____.

They had planned to go for a picnic, but because of the rain they had to stay home_______.

He found it hard for Alan to focus on his teachers for longer than five minutes, _________ if the lecture was boring. 

.—We’ll eat as soon as the meat is done.—It has__________to cook for another five minutes.

The committee is discussing the problem right now. It will ______ have been solved by the end of next week.