Instructions for homework have to be ______ so that every student knows clearly what is to do after class.
The modern history of Italy dates from 1860, ______ the country became united.
We will be shown around the city: schools, museums, and some other places, _______ other visitors seldom go.
The old building, behind _______ was a famous church, was _______ we used to work.
The little time we have together we’ll try _____ wisely.
. When he was working there he caught a serious illness from _____ efforts he still suffers.