1. He didn’t ____ write the report yesterday.
A) have to B) has to C) must D) mustn’t 1. _____
2. You can start operating the machine if the green light _____.
A) illuminated B) illuminate C) is illuminated D) illuminating 2. _____
3. While they were doing the tests the technicians _____.
A) monitored B) were monitoring C) would monitor D) monitoring 3. _____
4. In my job I’m responsible _____ maintaining and repairing all the equipment.
A) after B) on C) for D) in 4. _____
5. At school Jim enjoyed _____ technical drawings.
A) do B) to do C) doing D) has done 5. _____
6. The sensors detect a diff, which makes the robot _____.
A) reverse B) to reverse C) reverses D) reversing 6. _____
7. He asked me if I _____ help him repair the air-conditioner.
A) able B) am able C) could D) can 7. _____
8. Our company _____ unmanned vehicles since 1990.
A) produced B) produces C) has been producing D) has produce 8. _____
9. I don't mind _____ overtime.
A) to work B) work C) working D) worked 9. _____
10. Various additives _____ to improve properties of plastics.
A) have used B) use C) used D) are used 10. ____