Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1.If I (have) enough time right now, I (write) my parents a letter.
2.Michelle always answers the phone if she (be) in her office.
3.If I have enough apples, I (bake) an apple pie this afternoon.
4.I (be, not) a student in this class if English (be) my native language.