_______ on the American Civil War, the book attracted a large number of readers when it was published.
A．Based B．Basing
C．Having based D．Being based
I haven’t seen Li Lei these days. He was said _____ to the hospital to receive treatment.
A．to take B．to have taken
C．to be taken D．to have been taken
—Do you mind my closing the door? It’s a little bit cold in here.
—___________.
A．Go ahead B．Yes, you do C．Hold on D．Come on
Lucy couldn’t remember when she met Tom, but she was sure it was on ______Monday when she had ______ music class.
A．/; the B．the; / C．a; a D．/; a
I ______ an old letter while I was searching my drawer.
A．came up B．came across C．came on D．came about
Before taking the photo ,_______ the focus of the camera.
A．adopt B．adjust C．adapt D．check
