How did it______ that humans speak so many different languages?
| A．come out | B．come off | C．come about | D．come round |
I hear Mr Smith was writing a story last year and he still _____.
| A．do | B．does | C．is | D．am |
---What made her so sad?
---___she had lost her purse with a lot of money in.
| A．Because | B．Since | C．.What | D．That |
I can't tell you the exact when I will get there ____, I’ll be there as early as I can.
| A．No matter | B．Anyhow | C．Therefore | D．Besides |
Certainly I posted your letter---I remember ____it.
| A．posting | B．to post | C．to be posting | D．have posted |
Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
| A．to do | B．to have done |
| C．to be doing | D．to have been doing |