--- What ____ have happened to Kevin?
--- He might have run into some trouble.
A. could B. must C. would D. might
If you want to catch your flight, you’d better ____ for the airport right now.
A. cut off B. cheer up C. set off D. settle down
This song ____ me of my sweet childhood.
A. warns B. reminds C. memorizes D. informs
--- My watch is nowhere to be found.
--- Don’t worry! I’m sure it will ____ sometime when you’re not looking for it.
A. turn up B. put up C. take up D. pick up
Although it was only October, my kids were ____ Christmas.
A. looking up to B. looking out for
C. looking down on D. looking forward to
--- This must be a footprint of a tiger.
--- It ____ be. A tiger’s should be much larger and deeper than this.
A. mustn’t B. won’t C. shan’t D. can’t
