XXIII. Complete the first conditional sentences. 1. If we stay at home, we (miss) the show. 2. We (ask) about it, if you want. 3. If he (want) it, we'll buy it. 4. If it (not/ work) , we'll take it back. 5. They (not/ go) on holiday this year, if their friends come to see them. 6. You will be tired tomorrow if you (not/ go) to bed early. 7. The boys (wear) their new T-shirts tomorrow if it is sunny? 8. The cake (burn) if he doesn't turn off the oven. 9. We won't go to the beach tomorrow if it (rain) . 10. Will you walk to school if the bus (not/ come) soon? XXIV. Put the verbs in brackets into the correct tense or form. 1. If we ____(not stop) cutting down so many trees, we’ll endanger our oxygen supply. 2. Last year Mr. Johnson _______ (teach) us Robotics. 3. My sister is really busy – she ________ (study) for the exam. 4. In the future, robots ______ (do) things that people can’t do or don’t want to do. 5. Mark ____ (be) to Sa Pa twice. The first time ___ (be) more than ten years ago. 6. How often ______ (you/ do) household chores? ~ Every day. 7. Twenty years ago, most people around the world _______ (not know) what the Internet was. 8. If we dump all sorts of chemicals into rivers, we _______ (not be able to) swim in them in the future.