but

1 - A child with mild asthma may have an irritating cough each night, but is often fine during the day.

2 - Tremendous progress has been made in treating heart disease, but it is still the biggest killer of Americans, accounting for one in seven deaths.

3 - The pain made him lose his track but his random access memory came up with something else.

4 - It can be easy to be cynical about foreign aid in Haiti, but a deeper look reveals that Haiti has made real progress in recent years.

5 - Gene technology is a tool that offers potentially enormous benefits, but since it is still a relatively new technology, it is important that use of genetically modified organisms (GMOs) and products from GMOs are carefully regulated.