________ the difficult maths problem, I have consulted Professor Russell several times.
It was ten years ago ______ we last met in our hometown.
________ their inexperience, they’ve done a good job.
---- Mike, you clean the windows of the classroom this afternoon,_______? ---- But I cleaned them only yesterday.
Although he didn’t expect _______ me here, he advised _______ to the nearest restaurant.
The young man who we talked a lot about yesterday is unfit for the work, _____?