<span>1) I've been working on this problem for 3 months.
2) We have not received letters from her for several months.
3) Tomorrow father comes late. We'll tidy the apartment and we'll drink tea when he comes.
4) How long have you been waiting for me?
5) Yesterday, I met a friend whom I had not seen for a long time.
6) She's going to read a letter she has just received.
7) When did you see him last?
8) Do not talk to him, he is very busy, he is doing a very important job.
9) He was afraid that something would happen.
10) He has been watching TV since 6 o'clock.
11) What will you be doing tomorrow at 8:00?
12) I'll have done my homework by 6 o'clock tomorrow.
13) We have not had breakfast yet.
14) If I do not help him, he won't write the test well tomorrow.
15) - Have you ever been to Paris?- I'll go to Paris as soon as I solve this promlem<span>.</span></span>
2. Trees, birds, animals, grass, plants, mountains, valleys, parks, butterflies
3. 2) mustn't
3)can
4)must
5)mustn't
6)mustn't
7)can
8) must
Writer
Swimmer
Skater
Diver
Trainer
Traveller
Reporter
Painter
Visitor
Sailor
Collector
<span>Professor Saidov, who<span><em> won</em></span> a majorscience prize last month,<em><span> was invited </span></em>to take part in a conference which<span><em> was held </em></span>in London last week. A taxi-driver<em><span> met </span></em>him at the airport. Unfortunately, <em><span>was given</span></em></span><span> the name of the wrong hotel to take the professor to. A large reception<span><em> was organized </em></span>for the professor,and at least 200 eminent scientists<span><em> came </em></span>to meet him that evening. However, the poor professor<em><span> was left </span></em>at a small hotel in rather bad area, and when he asked the receptionist if he could speak to the Head of the Conference Committee. He<span><em> was told </em></span>to try somewhere else because he <span><em>was not heard of</em></span> there. Luckily, later that evening, the driver send to the hotel where the reception <span><em>was being held</em></span>,and when <span><em>was asked</em></span> what he had done with the professor, everyone realized that a mistake<span><em> was made.</em></span></span>
<span><span>1. stronger
2 . hotter
3 . coldest
4. worse
5. best
6. worsest
</span><span>1) stronger
2) hotter
3) the coldest, the best
4) worse
5) the best
6) the worst</span></span>