Keep the machine _______, and you will know how it works.
A. run B. to run C. running D. runs
—What was Tom doing _______ it was raining?
—He was doing his homework in the bedroom.
A. since B. while C. when D. if
Yesterday, a man said he saw _______ UFO in the park. The police are looking for _______ UFO now.
A. an; the B. the; the
C. a; the D. the; an
He _______ eight hundred thousand dollars for his Benz(奔驰) car.
A. paid B. cost C. took D. spent
She told us that she _______ her handbag on the bus.
A. left B. forgot C. missed D. failed
—_______? —My watch doesn’t work.
A. Why are you here B. How do you do
C. What’s wrong D. What’s this
