Dr. Percy Spencer invented the microwave oven. The invention happened by accident.

A. Because they didn’t think Newton could do it, he was confident.

B. They didn’t think Newton could do it because he was confident.

C. They didn’t think Newton could do it no matter how confident he was.

D. If they had thought Newton could do it, he would have been more confident.

A. Although Apple MacBook is portable and versatile, 1 cannot afford it.

B. Because Apple MacBook is portable and versatile, I cannot afforsd it.

C. If Apple MacBook isn’t portable and versatile, I might afford it.

D. No matter how portable and versatile Apple MacBook is, I can afford it.

A. Instead of trying to solve a problem, inventors' and engineers' initial ideas are to try different ideas, learn from mistakes, and try again.

B. Rarely do inventors' and engineers' initial ideas solve a problem rather than try different ideas, learn from mistakes, and try again.

C. Because inventors' and engineers' initial Ideas rarely solve a problem, they try different ideas, learn from mistakes, and try again.

D. Even though inventors' and engineers' initial ideas rarely solve a problem, they try different ideas, learn from mistakes, and try again.

A. The difference between Engineering and Inventing lies in the process they are conducted.

B. Engineering finds solutions to problem, while inventing creates things not ever existing.

C. Engineering focuses on developing solutions to problems, but inventing centers on creating new things.

D. The result of engineering is the development of solutions to problems, but that of inventing is the creation of new things.

A. Significant contributions have been made by scientists and inventors to the live of the common people.

B. Scientists and inventors had contributed significantly to the lives of the common people.

C. The lives of the common people have been significantly constructed by scientists and inventors.

D. The contributions which scientists and inventors made to the lives of the common people was significant.

A. Michael Faraday was employed by the Royal Institution, where he investigated the connections between electricity, magnetism and motion.

B. When Michael Faraday was employed by the Royal Institution, he investigated the connections between electricity, magnetism and motion.

C. The Royal Institution employed Michael Faraday to investigate the connections between electricity, magnetism and motion.

D. After he investigated the connections between electricity, magnetism and motion, Michael Faraday was employed by the Royal Institution.