—Linda, together with her parents, ______up the mess in the park at the moment.—It’s meaningful to be a volunteer. Let’s join them.

There are many people downstairs. What do you think ______?

Our teacher told us that light ______ faster than sound.

—Why didn’t you come to her birthday party yesterday evening?—I _______ a wonderful football match.

The meeting _ by the time I got there yesterday.