question: Complete the next sentence:

The word happy is written in pebbles on the side of the sand. a large body of crystal blue water

answer: is shown and a large boat with people are in it.

question: Complete the next sentence:

A man is standing at the start line clapping his hands, people look on. He takes off running and does a long jump. He salutes the large applauding audience. another man

answer: waits on the start line before accelerating into the long jump.

question: Complete the next sentence:

How to make a galvanometer
Select a compass.
A compass has a magnetic needle. This needle will allow you to detect electrical currents because electrical currents generate a magnetic field (and this field interacts with the needle).

answer:
The most effective compass will be one meant for navigational purposes (i.e. designed to align to the earth's magnetic field and point north), rather than a toy.