Выполнить задание по англ. яз

Choose the necessary form of the modal verb. 
.I … go to Paris next week because there is a very big exhibition there. 
can     3) may 
had to     4) be able to 
. This isn't a difficult task, so you … to complete it by Friday.  
will be able     3) should 
have      4) must 
. As you … remember, I was always interested in scientific experiments. 
must     3) are able to 
can     4) might 
. I hope that I … to take part in this research. 
ought     3) will be allowed 
has     4) can 
. Sorry, I’m late. I … wait till the experiment was completed. 
must     3) will be able to 
had to     4) could 
. … you give me the recipe for this cake? 
may     3) need 
must     4) could 
. You … finish the article as soon as possible. 
must     3) were allowed to 
may     4) can 
. He … give you his report on the advantages of using this device in your work later. 
1) has to     3) may 2) was to     4) can 
. You ... not enter the lab unless you have permission. 
must     3) ought 
can     4) may 
. ... you help me with my translation? 
may     3) could 
are     4) must 

Choose the necessary form of the Infinitive. 
1.One should read a lot … this problem. 
1) to understand     3) to be understood 2) to have understood     4) to have been understood 
2. Can anybody … me how to use a computer? 
be showing     3) show 
to have been showing     4)  to be shown 
3. This work is easy; it may … by a child, if you ask me. 
have done     3) to be done 
be doing     4) be done 
4. It is not enough to have a good mind; the main thing is … it. 
to be used     3) to be using 
to use     4) to have been used 
5. Looking at the books and papers on his desk he must … since they left him in the morning. 
be working     3) have worked 
work     4) have been working 
6. The problem … is of great importance. 
to solve     3) to have been solved 
to be solved     4) to be solving 
7. … national economy people have to use the natural resources more efficiently. 
to be developing     3) to be developed 
to have developed     4) to develop 
8. The methods …in the report were applied in our lab. 
to describe     3) to have been described 
to be described     4) to have described 
9. S. Kovalevskaya was the first among women … a professor.  
to become     3) become 
to have become     4) became 
10. She must … since morning. 
to be reading     3) to read 
be reading     4) have been reading 
 

1. To find a device better suited for our testing was the next problem to be solved.

2. To solve this problem it is necessary to know the principles of mechanics.

3. He didn’t expect to be invited to the international conference.

4. To make a report means to analyse a lot of scientific articles.

5. To determine the efficiency of the turbine, the engineers were to carry out some experiments.

6. Their task was to determine the properties of this substance.

7. To supply heat to a substance means to raise the temperature or to change the state of this substance.

8. To produce an optical glass the researcher made a number of experiments.

9. It is useless to discuss this question.

10. Having explained the structure and mechanics of the Universe, Newton laid down the Law of Universal Gravitation.

11. While reading English technical papers, on can come across various abbreviations.

12. Adding heat to a boiling liquid, we make it change its state without changing its temperature.

13. Having measured the potential difference, the students compared the data obtained.

14. Being rubbed, some substances become electrified.

15. Having been carefully tested, the turbine was put into operation.