Our plans for the trip fell down because we had no money

The students are playing volleyball since 8am.

Its ten o clock already.Its hime time you went home

a)these b)this c)those  gave him the idea of the pendulum,a device that enabled him to make the clock a scientific instrument for the first time

Galileo also noticed the regular a)swings b)swinging c)swaying of the lamps in Pisa Cathedral

a)to b)of c)with the square of the time it takes to fall