21.   A Sierra Club spokesman suggested that it was a sign that the Administration is finally getting serious about global warming.

22.   It shows how much we could do to address the threat of climate change if we were really serious about saving energy.

23.   You can be as serious about it as you want to be.

24.   First of all the company is very serious about taking up references.

25.   If you wanted to be an instructor and you were serious about gliding, you could probably achieve it in a couple of years.

26.   I am very, very serious about it I want to do much more to help.

27.   Conservative candidate Michael Fallon said if the Labour party was serious about tackling crime it would not be opposing proposals to toughen up bail.

28.   Are you serious about doing this?

29.   We have a lot of fun and a lot of laughs and I know he is serious about me.

30.   Ah, are you serious about this?