нужно вставить предложные слова.

( cause; do; express; get; have; make; provide; take part in; use)

1. positive/negative effect
2. an opinion
3. concern
4. a benefit
5. research
6. (good) grades at school
7. a computer/smartphone
8. online games
9. a decision
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1. she summer holidays in the country every year? - yes, she has many friends there.a) does spend    2. we stayed at home last weekend because my brother ill a) was3. mum, i a sore throat. could you make me some lemon tea? " of course, dear.b)have  4. what you to do next weekend?   c)are going5. now he a dig collection  b)has  6. when the friends a)did meet  b)do meet  c)will meet7. how is alice? - thanks, she better today.b)feels8. you after lessons and help me to decorate the   hall? c)will stay

Present Perfect, Past Simple, Past Continuous или Past Perfect. 1. They (told) me yesterday that you (had got) an excellent mark. 2. When did you (receive) a letter from your friend? 3. Our grandmother (was cooking) dinner from twelve till three yesterday. 4. Look! What beautiful flowers she (is buying)! 5. They ( travelled) along the coast of Africa last year. 6. We (have not  seen) each other for ages. 7. They (have  eaten) all the apples which I (brought). 8. When the children (had had) dinner, they (went) for a walk. 9. Last summer we ( lived) in the country and (went) to the river every day. 10. My sister ( spent) a lot of money yesterday. 11. She is so upset: she (has lost) the key to the front door. 12. By the 1st of September all the children (had returned) from the country. 13. Columbus ( discovered) America 500 years ago. 14. Columbus (did not  know) that he (had discovered) America. 15. I have already ( read) five English books. 16. He (had discussed) the problem with a lot of people before he (took) a decision. 17. Mother (has baked) a delicious cake! Sit down at the table and let's eat it! 18. She (was reading) an English book the whole evening yesterday. 19. I have never ( been) to Greece. 20. Have you ever ( been) to the Niagara Falls? 21. At this time yesterday they (were sitting) on the sofa and (listening) to their grandmother who (was telling) them fairy-tales. 22. My friend has just ( rung) me up from London. 23. I (was standing) at the tram-stop when it ( began) raining. 24. We (have not  skated) since last winter.