The store had to a number of clerks because sales were down.
| A．lay out | B．lay off | C．lay aside | D．lay down |
I will never forget the day _____ we spend together.
| A．when | B．on that | C．which | D．While |
I will never forget the day _____ we worked together in London.
| A．when | B．on that | C．which | D．while |
________ your letter, I would have started off two days ago.
| A．If I received | B．Should I receive |
| C．If I could have received | D．Had I received |
_______ you’ve got a chance, you might as well make full use of it.
| A．Even though | B．In case | C． Now that | D．Only if |
He devoted himself ________ to his research work, having no time to play.
| A．exactly | B．gratefully | C． loosely | D．entirely |