-  Excuse me, would you please speak a little more_______? -Sorry, I thought you could follow me.

 --____ has your grandpa lived here?       --Since last year.

—Do you go to school by bus every day?—Yes, I ________ take a bus.

The 3-month-old baby cried from time to time last night. His parents     had a good sleep.

-- Is air the lightest thing in the world?-- Not            . Scientists from Zhejiang University have just developed the world’s lightest material.