Every device ______in the plane must be designed and made with great care so as to make sure that nothing goes wrong in operation.
29. It is known to us that doing eye exercises ________ our eyes, and that is to say, our eyes can ________ doing eye exercises.
28. I have a really bad headache, and I have to ________ a doctor about my pains.
27. ________ of the ________ life in the city, Mr Blaster, with his wife and daughter, moved to the countryside.
26. I think the student ought to be punished. He shouldn’t ________ cheating in the exam.
25. The boy ________ on the ground ________ to me that he ________ the book on the table.