Has everything _____ can be done ______?

You made many mistakes in your English exams. What will you ___them?

of our classmates are good at basketball.

What do you think of the book A Haw Tree written by a woman writer? —It reminds me of the days _______ I spent in the countryside. [ ]

Which of the two T-shirts will you take?—I’ll take ___, one for my father, the other for myself.