С!

i. раскройте скобки, употребив нужный модальный глагол.

1. engineer (должен) use new methods of metal treatment in his work.
2. a power-driven machine (может) perform different operations.
3. he (не смог) control that device.
4. people (могут) use heat, electricity and light for many purposes.
5. (можно) i try to work at this machine-tool?

ii. замените модальные глаголы эквивалентами.

1. he can not find the solution of this problem.
2. you must use this equipment.
3. the mechanic can solve different practical problems.
4. can you help me?
5. he may use this device for his experiment.