— Shall I tell Tom about it ? — No , you ____ . I''ve told him already .
The field research will take Joan and Paul about five months; it will be a long time __________ we meet them again.
It has been announced that candidates(应考者) ________ remain in their seats until all the papers have been collected.
I ________ pay Tracy a visit, but I am not sure whether I will have time this Sunday.
The book was written in 1946, __________ the education system has witnessed great charges.
—Where did you get to know her?—It was on the farm __________ we worked.