We __________for a picnic if it ___________this Sunday.

Their cheerful voices showed that they were having a discussion.

couldn’t have done a better job for me, Jack!— Thank you, Mr. White. ______.

Now the air in Yancheng is _______ than it used to be . Something must be done to stop it .

You can only be sure of_____you have atpresent;you cannot be sure of somethingyou might get in thefuture.