Ex. 2. Write the sentences, choosing one of the modals. 1. We are leaving tonight, so you (should/must) buy a ticket for the flight. 2. (May/Might) I come in? 3. David (can/could) cook well when he wants to. 4. 'Do you think it (can/might) rain?' 'Yes, possibly. We don't want to get wet so I think we (should/must) take our raincoats.' 5. Jenny tried to carry him but she (can't/couldn't 6. We (can/might) visit my cousin in Australia next year but we don't know yet. 7. In many countries, you (should/must) wear a seat belt in the car - it's the law. 8. (Can/May) you hold this for me, please? 9. I know they enjoy their work but they (shouldn't/'mustn't) work at the weekends. It's not good for them. I think they (should/must) spend time at home with their families. 10. The letter (can/may) arrive tomorrow.

The Russian Federation was set up by the Constitution of 1993. 
Politically it is a presidential (or a constitutional) republic. 
The head of state is the President. 
His functions are to control all the three branches of power. The President is commander-in-chief of the armed forces, he makes treaties and enforces laws, appoints the prime minister, cabinet members and key judges. 
There are three branches of power: legislative, executive and judicial.  
The Federal Assembly consists of the Federation Council (upper house) 
and the State Duma (lower house). 
The State Duma is elected by popular vote for a four-year period. 
The Federation Council is formed of the heads of the regions.
The legislative power is vested in the Federal Assembly.
The executive power belongs to the Government.
The judicial power is represented by the Constitutional Court, the Supreme Court and regional courts.

1.  (Did you have) a good time last weekend?
2. I  (have seen) that film three times but I’d like to see it again.
3. She (was talking) to Mary when I saw her in town.
4. Where  (are you going) for your holidays next year?
5. Be careful with that glass. If you drop it, it  (may break)
6. I usually  (go out) with Joanna on Saturday nights but she’s away this weekend.
7. Where’s Annie? She (is doing) the shopping at the moment.
8. It was a beautiful morning. The sun ……… and the birds ……… . (was shining/ were singing)
9. If you (do not study) harder, you’ll fail the exam.