Living in the mountain area has its problems, ________ obtaining water is a big problem.

It`s already 10 o`clock. I wonder how itthatshe was two hours late on such a short trip.

I can’t learn math well. Can you give me some ________

You should be ________ a diet; otherwise you will get fatter and fatter

e know, keeping positive is beneficial to the process of our work and study.— You can say that again. Struggle not to let negative ideas_______.