Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
During the summer vocation we went back to the school __ to pay a visit to our teachers though it was _____ hot.
She goes to school every day ____ Sunday.
Her composition is well written ___ some spelling mistakes.
"You ____be so tired that you had to stop to rest."
He must have finished the work yesterday, ____ he ?