Several weeks had gone by _______ I knew the painting was missing.
---- Please don’t call me between 8:00 and 10:00 when we will be having a meeting. ----____________
You’d better take a map with you when you go to a strange place ___ you get lost.
--- In what way will you use your portable computer? --- I’ll use it _____ for giving lectures at home and abroad.
The teacher set such difficult problems ______ nobody could work out _____ none of us passed the test.
By the time I see you again, I _______ from that school.