Read the sentences about possible actions and choose the best words to complete them.

Choose the correct option.

When they [go|goes] to Mars, they will take some electronic devices for life.
If she gets a new mobile phone, she [will install|installed] many games and apps.
If you [go|will go] to the birthday party, you will see a lot of friends there.
If they [buy|will buys] new headphones, they will listen to music without any technical problems.