Ken ________ his jacket in the gym．He has to get it back．

—What did you do last night？
—I ________ TV and read books．
A．watch
B．watched
C．have watched

—Dave called you about half an hour ________，Anna．
—Thank you．I’ll call him back．

—I called you yesterday evening，but you were not in．
—Sorry．I ________ in the shop with my mother．

________ is really hard ________ them to climb such a high mountain．