The new comers found it impossible to________ themselves to the climate sufficiently to make permanent homes in the new countries.
Our duty is to ______ their country against both domestic and foreign enemies’ attack.
-Bob failed in the exam again. -He ________ it;he never worked hard.
______ people are standing outside the office. _____ people there is at least over 1,000.
You should always _____ your conclusion _____ careful research.
We won’t give up ________ we should fail ten times.