Decide which career to choose.

Explanation:

• The correct form of the verb must be used to show the tense of the sentence.

• The form of the verb depends on the word that is before the verb and the subject of the sentence and the tense.

• The second form of the verb is mostly used in the Past tenses, whereas the first forms of the verb are used in Present tenses.

• And in continuous sentences "ing" is added to show the action is still going on.