ESL 4 2020-2021

When you ____ something, you stick it to something else.

• attach

• captive

• challenge

• experiment

A ___ animal is not free to leave.

• captive

• challenge

• experiment

• invention

A ____ is something that is hard to do.

• challenge

• experiment

• invention

• record

When you _____, you try an idea.

• experiment

• invention

• record

• scientist

An ___ is something that is made for the first time.

• invention

• record

• scientist

• test

When you ______, you make a copy.

• record

• scientist

• test

• attach

A _____ studies things in nature.

• scientist

• test

• attach

• captive

When you ___ something, you try it.

• test

• attach

• captive

• challenge

To move ____ is to move toward the back.

• backward

• concentrate

• convince

• destination

When you ___ you think about what you do.

• concentrate

• convince

• destination

• forward