1. Какова концентрация раствора, полученного смешением 70г поваренной соли 500г воды?

воды=500г

соли=70г

отсюда

Раствора=500+70=570

находим %соли: 70/570*100=12,2%

%воды=100-12,2=87,8

Составьте предложения со словами:
Do archery, miss flight, climb walls, walking, run out of cash, buy souvenirs, get a flat tyre, visit historic sites, try local food, car break down, lose luggage, have your wallet stolen, learn scuba diving.
II. Выберите правильный вариант: Future Simple, to be going to, Present Continuous, Conditionals, Might/Could, will probably, will definitely.

1. The tourists ... wind-surfing to the coast in summer.
a) Are going
b) Will go
c) Go
2. I don’t think we … a quad bike. It’s too dangerous.
a) are driving
b) drive
c) will drive
3. We … tonight.
a) eat
b) will eat
c) are eating
4. My parents … to London in an hour.
a) will fly
b) fly
c) are flying
5. I … to take scuba diving lessons.
a) am going to
b) is going to
c) will
6. If the weather is fine, we … .
a) will sunbathe
b) sunbathe
c) sunbathes
7. If you mix red and white, you … pink.
a) will get
b) gets
c) get
8. There is no news from him. He … still be in the holiday camp.
a) could
b) might
c) may
9. The flight from the USA to Japan will … be expensive.
a) could
b) definitely
c) probably
III. Выбери правильный вариант.
1. How can I help you?
2. What would you like to know?
3. How much does it cost to get in?
4. Can I help you with anything else?
5. What is the best way to get there by car?
a) Just head for Twin Peaks town centre on TE-50 and continue straight.
b) No, I think that’s all, thank you.
c) What are the opening hours?
d) It’ 5$ adults and 2.50$ for children.
e) I’m calling for some information.