Scientists are convinced __________ the positive effect of laughter _________ physical and mental health.

Only after Mary read her composition the second time _________ the spelling mistake.

The math problem is _____ difficult that only _____students can work it out.

With two sons ______ in Afghanistan, John and Susie Mayes are working extra hard this year to make sure their grandchildren have a great Christmas.

. I don’t feel ____ this morning; I will goand have a lie-down.