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Complete the sentences with the correct forms of the verbs below (using present or future tenses). Use the full forms of the verbs.
Write one, two, or three words in each gap.

to break, to take, to be, to learn

1. I think my little brother ... happy about all these desserts.

2. I am sure he ... his promise.

3. My husband's plane ... off at 6:15 am.

4. By the end of the twenty-first century, we ... more about aliens.