After years of failed trials, the vaccine was a medical ___.

Researchers announced a ___ in battery design.

The successful treatment marks an important scientific ___.

Years of failed work finally produced a major ___.

The hidden cave painting was an unexpected ___.

Her ___ changed what scientists knew about the disease.

The team celebrated the ___ of a new species.

An unknown chemical appeared during the test, leading to a ___.

The first controlled ___ failed because the equipment broke.

Each ___ produced data using the same careful procedure.

The class designed an ___ to test plant growth.

Results from one small controlled ___ are not enough.

The blood samples were sent to a ___.

Students must wear coats inside the ___.

The university built a new research ___.

All chemicals are stored safely in the ___.

The final ___ was accurate to one millimeter.

Take each ___ twice to reduce errors.

The nurse took a careful ___ of the wound.

A wrong ___ changed the calculation completely.

Photosynthesis is a natural ___ in plants.

The approval ___ may take several months.

Heating is the final ___ in production.

The diagram explains each stage of the ___.

Each ___ interviewed twenty participants during the study.

A young ___ noticed the unusual result.

The lead ___ presented the findings at the conference.

Every ___ must follow the safety rules.

The claim needs ___ evidence before publication.

The article describes a ___ method based on controlled testing.

Her explanation is based on carefully tested ___ research.

The museum displays several important ___ instruments from history.

The results support his ___ about memory.

The physicist developed a famous scientific ___.

The professor used a diagram to explain her ___ about animal migration.

New evidence forced them to change the ___.

Scientists use controlled experiments to ___ very carefully.

The team designed a study to ___ about memory.

Researchers gather repeated results when they want to ___.

Researchers collected new data to ___ about bird migration.

The students will ___ in the laboratory tomorrow.

Wear gloves whenever you ___ with strong chemicals.

The team received permission to use animals and ___.

They need more equipment to ___ safely.

The lawyer could not ___ that the document was false.

One example does not ___ the general claim.

Scientists hope the results will ___ their prediction.

Can you ___ that the machine is unsafe?