Children under sixteen are not permitted to participate in such kind of activities _____ bad for their mental development.
__________ these tips, and your time _______ doing research on the Internet _________ much worthwhile.
Listen! Peter is singing in the classroom! —It _____ be him. He has gone back to his hometown.
I didn’t go to the Museum yesterday.—Yes, but I would rather you ______there too.
The red socks$4.