My new pen __________.Who __________ have taken it?

Since we ____ for almost two weeks, I’ll need to buy a large backpack in advance to carry my supplies of food and water.

I_____ violin lessons every two weeks, but I think I ‘ll make it every week from next month.

—Why don't you go home?—Because a lot of work________yet.

Since Mr. Evans took over the firm last month, he _____ to the busy schedule.