Подчеркните в них модальные глаголы или их эквиваленты.
1. These substances are to be analyzed at our laboratory.
2. Nobody will be able to measure the density of this substance without a special device.
3. Manhattan can be called the centre of New York City.
4. Each invalid is to attend school in USA as there are all necessary conditions for them to study.
5. Energy can exist in many forms and each form can be transformed into the other.
6. Using radioactive isotopes the scientists will be able to carry out many experiments.
7. He had to work hard before he was able to submit his paper to a scien-tific journal.
8. The chemists may use the reactor to analyze various substances for their exact composition.