Допустим, что небольшой космический корабль, масса которого вместе с экипажем равна 1460 кг, оказался в космическом пространстве

1. We have a great time at Mike's dacha unless his parents also are there. 
2. If they're going to Greece in April, I won't be able to join them. 
3. If you don't spend time in the sun, you won't get a suntan. 
4. Will they come round tomorrow if I phone and invite them? 
5. If you don't turn off the TV, I'll break it! 
6. Will she eat out with me if I ask her to? 
7. Kate will enjoy herself at the party if Max comes too. 
8. I'll have to stay in if my mother wants me to help her about the house. 
9. Listen, if you go to the cinema tonight, will you take my sister with you? 
10. If I go to Moscow on the spring holidays, I'll try to get in as much entertainment as I can!