... comes 49/ a. shelter b. holes c, houses d. caves 50/ a. synthetic b. fibre c. timber d. silk Dap An, 1d, 2a, 3c, 4c, 5d, 6a, 7c, 8a, 9d, 10a, 11a, 12d, 13a, 14b, 15b, 1a, 17c, 18a, 19c, 20d, ... 20d, 21c, 22d, 23a, 24a, 25d, 26b, 27c, 28c, 29c, 30d, 31d, 32b, 33c, 34a, 35b, 36d, 37a, 38b, 39c, 40a, 41c, 42b, 43a, 44c, 45b, 46c, 47a, 48d, 49c, 50b ... more 18/ How much is this sewing ________? a. machine b. machining c. machinist d. machinery 19/ She is a biologist. She is interested in ________. a. conserves b. conservancy c. conservation...