Answer:
A cello is a large instrument with four strings. Similarly, a violin has four strings that can be played by hand or with a bow. (using one of the words)
All would seem appropriate, but I'd say D, since it assists you in gathering data to support your clause
Increasing fuel efficiency can help us both financially and ethically
Answer:
The answer all depends on your current living conditions and the amount of money you posses. IF you had a steady and secure job that paid a lot and you had a good house with constant food source then yes. IF you have a job that doesn't pay a lot then obviously no. Working only one or two days today would be hard, and I speak from a bit of experience as my parents work 6 jobs and we still struggle sometimes. So the answer is it depends on the type of job you have.