living on a space station

Put the verbs in parentheses into the simple present tense.

. The astronauts  lives  (live) without daily luxuries such as hot showers.

. They  don't haves  (not/have) much free time.

. Zero gravity  affect  (affect) their health.

. If an astronaut  Don't exercise  (not/exercise) daily, he won't be able to walk when he  comes  (come) back to earth.

. Astronauts wash  (wash) their hair with a riseless shampoo.

. The crew eats (eat), play (play), sleep (sleep) and takes (take) a bath in the middeck.

The water cycle

Put the verbs in parentheses into the correct tense

- When it   rains  (rain, the water   runs  (run)off the ground info lakes and rivers.

- When water droplets in clouds   gets  (get) too heavy, it   rains  (rain).

- When vapor   rises  (rise) into the air, it    forms  (form) clouds.

- When the sun   heats   (heat) the water in the ocean, there  is  (be) vapor.

- When the sun  is  (be) out, it   heat    the water in the oceans.