_______ Andy was playing，his mother came home．
A．While B．Until C．Although D．Since
一Look! There is a small bridge on the river．
一It ________ two days ago．
A．built B．was built
C．has built D．has been built
It is said that the gravity on Mars is only about __________ of the gravity on earth．
A．three-eighths B．third-eighth
C．three-eighth D．third-eighths
---I met Daniel in the street yesterday, I ________ him since he left for Beijing．
--- Well, does he look like what he used to be?
A．haven’t seen B．didn’t see
C．hadn’t seen D．wouldn’t see
The old man keeps coughing________．I’m afraid you have to send him to hospital．
A．between morning to night
B．from morning to night
C．between morning and night
D．from morning and night
In the nineteenth century, English became international language．
A．an B．a C．/ D．The
