—What do you think of teaching,Bob?—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
He offered to _____ her a hand as the suitcase was too heavy for her to carry.
I have been looking for this book for months, and _____ I have found it.
She was putting on her watch when the _____ broke and it fell to the ground.
—I would like to buy an expensive camera. —Well, we have several models_____ .
I remember_____the factory owed a small workshop and two machines.