--What you for your vacation? --I plan to visit my grandparents.
If you keep on working hard, I have no doubt ______ you’ll be successful in the future.
My father has never been to school, so he can ________ read _______ write.
She devoted as much time as she could ____________ others.
Sam is a little weak in English and he has _____ what the teacher says in class.
______ great fun they had singing and dancing last Sunday night!