Question

For years the researchers have been trying to understand

the problem for obesity. While it is easy (a)___________ ___________

to gain weight, it was nearly impossible to (b) ___________ ____________

lose extra weight. It is therefore essential (c) ___________ ___________

to eat healthy food and do physically exercise (d)_________

omission ​

Answer 1

Answer:

which class question is this?