UNIT 7.1 (1)

Scientists think the songs of whales (a)   messages for other whales.

• pause

• contain

• migrate

The messages in whale songs are (a)   for other whales to follow during migration.

• guidelines

• surfaces

• pauses

Whales use songs to (a)   their movements as they migrate.

• pause

• contain

• coordinate

Whales need to (a)   to breathe.

• migrate

• contain

• surface

Whale songs are (a)   and very simple.

• surface

• basic

• coordinate

Whales (a)   thousands of miles every year.

• surface

• pause

• migrate

Singing underwater, the whales do not (a)   between themes in their songs.

• contain

• pause

• element

Whale songs use (a)   such as clicks, whistles, and snores.

• elements

• pauses

• guidelines