Half of the work ______ by now. A. has finished B. has been finished C. have been finished
—Is Mike at home? —No. He _______ with his brother.
Tom is a good boy and he writes _________ in his class.
—Which colour do you like _______, blue or green? —Blue.
—______ you help me mend the radio? —Yes, I can.
There is ______ wrong with this computer. It doesn’t work.