--- Thank you for inviting me to your new house.--- ________. Just help yourself.
It is cruel___ them to catch the sharks and cut______ their fins.
- Would you please take this workbook to the teacher's office for me?— ________.
I regret ______ to my head teacher,not listening to him.
—The meeting _______ because of the fog in Northern China last week.— Oh, it’s too bad! We should take action to improve the air quality.
— I wonder if I can learn English well.— _______. All things are difficult before they are easy.