You had better say “Thank you” when you __________ with the medal.

International situation is currently undergoing great changes ________ UNESCO plays an irreplaceable role in promoting international cooperation.

I read the 21st Century Senior 2 Edition every day —_____ no wonder that your vocabulary is so large

Mrs.Smith finds it hard to clear up the mess, as her children are always ________ whenever she tries to.

— Have you seen Tony recently? — No, but I ______ dinner with him on Sunday. [ ]