Whose shirt is this? Is it Tom’s? —No, it isn’t, ______ is white.

______ a certain doubt among the people as to the practical value of the project.

Is this factory ______you visited last week?

Mom, my classmates invited me ____ a field trip. May I go with them?—OK.

Being too much fat, Cathy was advised to reduce her food for each meal, yet she would ____ that.