Mt Everest (珠穆朗玛峰) is 8, 844. 43 meters ______ sea level. [ ]

She will call you if she ____.

When Tom got to the examination room, he realized he ______ his pen at home.－Oh, he is too careless.

Nancy spent half an hour _______ playing the piano every day.

We didn’t plan our art exhibition like that but it _______ very well.