When contractors need drainage system they make a ______ long narrow hole dug into the surface of th...: ответ на тест 1077754 - Английский язык

Contractors have to spend some time on _____ up the ground to make a ditch.

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Wells
Look at the three types of wells in FIG.1. 1_______. It consists of a pipe, a point and a pump. You hammer the pipe into the ground until the point is below water level. The pipe is usually less than 10 mm wide and less than 20 m long. 2_______.
Well B is the cheapest because it has no pump. It uses a bucket and rope. The hole is usually more than 1 m wide. Well B is usually about the same depth as Well A.
3_______. The hole is usually less than 0.3 m wide, and the pipe has the same width as the one in Well A. The depth is usually more than 20 m. 4_______.

Contractors have to spend some time on _____ up the ground to make a ditch.

All cells arise from other cells through …

In the process of evolution populations are altered over time, hybridize together, or _______ by extinction.

Trees play a significant role in reducing ________ of soil and moderating the climate.