и еще последнее

Буду очень и очень благодарна за помощь!! Я вот только два задания из 12 не могу сделать )) Это прогресс, т.к. я английский почти не знаю))

Task 9. Fill in the proper modal verb.

1. The fuse (должен) be placed in every circuit where there is a danger of overloading the line.

2. Without electricity man (должен был) work only during day light hours.

3. In order to maintain an electric current, a steady electric field (должно) be provided.

4. It is important to realize that electric current (может быть) pro-vided only while the magnet is moving.

5. Motors (могут) be designed to run on either direct or alternating current.

6. Some materials, when heated (могут) generate a continuous flow of electricity.

7. We (не можем) imagine our life without electricity.

8. Voltage (может) be measured by using the meter.

9. Current of great value (должен) applied to insulators in order to make them conduct.

10.The lamps in your room and your house (должен) connect in parallel.