But they also add a lot of serious challenges to our work.

Since the summer, we've added a lot of other small features, which I haven't reported here.

That's how I think all the moving added a lot to me.

What you say is not useful actually can add a lot of value.

They also added a lot of fun to our lives.

The camp leaders can add a lot to the experience.

"I think they add a lot of interest to the situation."

I know you can't add a lot to the curriculum - there's too much to learn right now.

The decision he must now make has added a lot of pressure.

A new roof can add a lot to your house's worth.