Happy birthday, Alice! So you have _________ twenty-one already!
He could have finished it on schedule, but __________ he fell behind.
Now that she is out of job, Lucy __________ going back to school, but she hasn't decided yet.
The first use of atomic weapons was in 1945, and their power __________ increased enormously eversince.
I__________ letters this morning and I__________ for four hours so far.
They __________ on the program for almost one week before I joined them, and now we __________ it as no good results have come out so far.