happen
- If you happen to get lost in the wild, you’d better stay ______ you are and wait for help.
- When did it happen? —At 5:55 a.m. ______ the morning of October 15.[ ]
- What will happen _______ people if they don’t protect the environment?[ ]
- How will you feel when ____?
- What ________happen if they have the party today?
- What ________ if there ______ no water or air on the earth?
- What_____just now?