Those farmers who _________ move from place to place with their animals in the past have moved into new houses at last.
_____ from heart trouble for years, Professor White has to take some medicine with him wherever he goes.
----_____I return the dictionary within three days? ----No, you_____. You_____ it for five days.
Controlling water-pollution is necessary_____ it will be expensive.
Such a person _____ you talked about is seldom seen now.
_______ the teacher’s instruction in the lab_____ important.