Last night, we attended a concert ______ music by Haydn and Mozart, which was a feast for the ears.
These desks and chairs can be ___ to the height of any child.
I really don’t know for certain____ they discussed.this important event very secretly.
_____ you keep on working hard, I don’t mind whether you get good marks in your class.
-----If I wasn’t busy., I could have been back by 5:30 o’clock. ----- What a pity! She____ here to see you.
They are determined to work out the task,____difficult it is.