Complete the sentences. Use the words in the box ( Hoàn thành câu,sử dụng các từ trong bảng) learn dangerous different carry messy tasks Some(1)_______ are difficult or (2)_______for people. But robots can help us with them. There are many (3)____ kinds of robots. Some helps us to clean a (4)___house or (5)_____ heavy things. Some robots help us (6)____ more about places outside Earth.