Please remember _______ the computers down when you leave the office.
A. to shut B. shuts C. shutting D. shut
The story _______ about fifty years ago.
A. was happened B. happened
C. was happening D. would happen
He arrived____ London ____ a cold winter night.
A. at; at B. in; on C. in; in D. \; on
When I walked past her room, I heard her _______ an English song.
A. singing B. was singing
C. sang D. is singing
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
