Tom and Mike enjoy _______ TV.

Have you been to the Great Wall? —Perhaps not in my memory. ________, it might have been during my early childhood.

It took him ____ to find the key to the drawer.

There are many cars coming up and down. If you insist on standing there, you will risk _________ down on the ground.

We usually go to school on weekdays, and sometimes go to cinema at weekends.