5..........a large hole in the side of a mountain or under the ground.
A. Waterfall B. Cave C. Bay D.lake
6.Household and garden waste is collected ….... compost.
A To do B. To make C. To have D. To change
9. It is difficult to find …………at busy times in Da Lat.
A. Accommodations B. Hotels C. Guest houses D. All are corrcet