Chia động từ trong ngoặc để hoàn thành văn bản

Neil Armstrong was the first man ...(step) on the moon -It ...(happen ) in 1969 and then people ...(believe) that they ...( be able) ...(start) ...(live) there in the near future . However , nothing that ...( occur) as yet and they seem ...(lose) their interest in ...( colonise) the silver globe