The achievements we have made are largely ___ the hard work of our parents and teachers.
—You don’t believe in aliens, do you ? —__________. It’s a crazy idea.________
Either you or one of your students ________ to attend the meeting that is due tomorrow.
________, he stopped working to have some snacks.
The airline stewardess (空姐) said to passengers on ______ with a beautiful smile, “welcome _________!”
He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.