If you are free to walk through out city, please ________ us.A drop in B drop in at C. drop in on
Neither Kate nor her cousin _____ to Russia, but _____ of them have known the country very well.
His aunt wants to _______ him to fix the watch, but he has had it _______ already.
–Thank you for offering to help me with my maths. –_______________.
We all want to try something new, but finding the ______ to start is always the hardest part.
–Finish your homework, _______ you can’t watch football games, Sam. –All right, Mum.