—What’s this? —It’s a machine which was invented in __________century in China.
---I ’m going to the post office. ---________you’re there, can you get me some stamps?
Can you imagine _______________ on the earth in the future?
Teenagers would rather ________ phone calls while businessmen prefer ________ e-mails to communicate with each other.
He was so sad even though he mademistakes in the exam.
____________suggestion he offered! It will be of great help.