This ___________ is used to clean water., powder, develop, weigh, contain, You need to ________the powder with water before using it., powder, mix, produce, contain, Please___________the bag before you take it on the plane., powder, mix, weigh, contain, This drink does not _________ sugar., powder, produce, weigh, contain, The transport __________ in the city is very busy., system, produce, stick, develop, The factory can ____________ a lot of products every day., system, produce, stick, develop, Be careful — the chewing gum may __________to the chair., system, produce, stick, develop, Engineers____________ new machines to save energy., system, mix, stick, develop, This __________ is strong but very light., material, do research into, discover, run tests, Scientists ___________ into new ways to protect the environment., material, do research into, discover, run tests, They hope to __________ something new and useful., material, stick, discover, run tests, Before selling the product, they _________ to check if it is safe., material, mix, discover, run tests

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