还得麻烦你了 I hope scientists _____(find)a cure for cancer
还得麻烦你了 I hope scientists _____(find)a cure for cancer
By the middle of this century ,more people _____(live)in cities than in the country
Ten years from now,people ______(wear)smart clothes
No one_______ever_______(live)on Mars
Humans ________(live)on another plants five billion years from now
A chinese astronaut ______(reach)Mars by 2050