Can vegtables be p_ in winter? Yes,but a greenhouse must be b_ first.The greenhouse should be m_of glass.A large greenhouse may be ten metres l_three metres w_.and two metres high. The sunshine can r_the vegetables t_the glass.The wind and cold air can be s_from getting in. The air inside the greenhouse is always w_.More and more greenhouse are b_built all over the world.All kinds of vegetables can be brought onto our dinner tables in winter.