—How much is _______ for a schoolbag? —Experts say students should carry_______ more than 10 or 15 percent of their body weight.

He got completely         when he saw both Lucy and Lily, who are twin sisters.  

Looking you straight in the eye does not mean the person is telling the truth. Experienced liars often do this in a(an)______way, playing on people believing the myth.

Interest is as      to learning as the ability to understand , even more so.

I'm afraid this painting is not by Picasso. It's only a copy and so it's _____.