—Have you handed in your schoolwork yet?
—Yes, I have. I guess it ______ now.
| A．has graded | B．is graded | C．is being graded | D．is grading |
Leave your key with a neighbor ______you lock yourself out one day．
| A．ever since | B．even if | C．soon after | D．in case |
A new_____ bus service to Tianjin Airport started to operate two months ago．
| A．normal | B．usual | C．regular | D．common |
----Do yon have a minute? I’ ve got something to tell you．
-----0K．______you make it short．
| A．now that | B．if only | C．so long as | D．every time |
Scientists are convinced--- the positive effect of laughter___ physical and mental health．
| A．of；at | B．by；in | C．of；on | D．on：at |
---I think he is taking all active Dan in social work． ---I agree with you ________ ．
| A．in a way | B．On the way | C．by the way | D．in the way |