—Look! A book is on the floor. Whose is it?—It ______be Rick's. It has his name on it.
We believe we can _____ a way to solve the problem of pollution in the future.
About ____of the students in Grade Nine this year were born in the_____.
___ girl who will perform at the party tomorrow comes from _______European country.
—I am leaving for Switzerland next week. —_____________________!
Sue has many nice dresses.She wears a different one every day _____ the week.