The newcomers found if impossible to _______themselves to the climate sufficiently to make permanent homes in the new country.
Only by practising a few hours every day ____ be able to master the language.
Not until I began to work ____ how much time I had wasted.
I want to be left alone ___ things out.
Before __ the trunk must be checked.
The young Swede was made ___ a lot of practice before the Napoleon’s inspection.