Question

A greenhouse is a glass-covered structure (1) __________ (uses, using, used) to grow plants. it has transparent glass that allows sunlight to pass (2) ________ (out, through , inside), but does not allow the heat inside to escape. the same (3) ________ (effect, affect) occurs on the earth. the (4) ________ (sun's, suns, sun) radiation (5) __________ (passes, passing) through the atmosphere to heat the earth's surface. when heated, the earth's surface produces infrared radiation, which has a longer wavelength than that of sunlight. this infrared radiation rises into the atmosphere where gases, such as carbon dioxide, (6) ____________ (prevents, prevent, prevented) the infrared radiation from escaping into space. the concentrations of these gases, (7) __________ (that, those, which) are called greenhouse gases, control how much-infrared radiation escapes.

Answer 1

1.used
2.through
3.effect
4.sun's
5.passing
6.prevent
7.which

Answer 2

Explanation:

A green house' is a 'glass covered structure' (1) used to 'grow plants'. It has 'transparent glass' that allows 'sunlight' to pass (2) through it but does 'not allow the heat' to escape. The 'same (3) effect' occurs on the earth.  

The (4) 'sun's radiation' (5) passes through the 'atmosphere' to 'heat the 'earth's surface'. When heated the 'earth's surface' produces 'infrared radiation', which has a 'longer wavelength' than that of 'sunlight'.

This 'infrared radiation' rises into the 'atmosphere' where gases, such as 'carbon dioxide', (6) prevent the 'infrared radiation' from 'escaping into space'.  

The 'concentrations of (7) these gases' which are called 'greenhouse gases', control how much- 'infrared radiation' escapes.