—Where did you get this book?
—I picked it up from a second-hand bookshop if you ______ know.
| A．must | B．will | C．can | D．shall |
Is it the years____you worked in the factory_____have a great effect on your literary works?
| A． | that; where | B． | when; that | C． | that; that | D． | which; that |
Some medicine, when wrongly____,can kill a person.
| A．take | B．taking | C．Taken | D．to take |
What terrible weather! It_____heavily for as long as eight hours.
| A．snows | B．snowed | C．is snowing | D．has been snowing |
His mother always keeps telling him to ______ his table manners.
| A．care | B．observe | C．mind | D．notice |
This is the very dictionary____which Mr. Smith came here the other day.
| A．by | B．for | C．in | D．on |