6. The crew spend their day (doing) science (experiments) and they (carry in) checks for the (maintenance) of the station. 7. We’(d better) (hurry) , or the train (might) (leaves) without us. 8. Neil Armstrong, (the first) man (to walk) on the moon, (who taught) at Cinninati University in the (1970s). 9. (When) you are in (orbit), you will be able to (get out) your seat and (walk in the cabin). 10. If I (were a little taller I (could be) astronaut, but I (don't meet) the height requirement. 11. My father (doesn’t care) how much (does the car cost) because he is (going to buy) it (anyway). 12. (Many) people agree that (writing) letters (are) a nice way (of keeping) in touch.