He_____ articles for our wall-newspaper these years, and he____ about thirty articles.
A．has written; wrote B．has been writing; wrote
C．is writing; has been writing D．has been writing; has written
The coasted areas have mild winters, but ____ the central plains become extremely cold.
A．by contrast B．with contrast C．contrast D．contrasting
In a way it was a(n)______ to know exactly what we were up against.
A．effect B．means C．relief D．suggestion
The programme was so exciting that the children kept their eyes____ on the screen.
A．to fix B．fixed C．to be fixed D．fixing
-- What’s the matter with you?
---____ the window, my finger was cut unexpectedly.
A．Cleaning B．To clean C．While cleaning D．While I was cleaning
--You were brave enough to raise objections at the meeting.
---Well, now I regret____ that.
A．to do B．to be doing C．to have done D．having done
