Crops such as peas or soybeans put important minerals back into the soil, ______ it ready for crops that need fertile soil.
A. makes B. to make C. made D. making
You may find it _______ that Charlie was taught to sing as soon as he could speak.
A. astonishing B. astonished C. to be astonished D. to be astonishing
Since then, finding ways to grow more peanuts ______ his life goal.
A. has been B. were C. was D. have been
______ with new scientific farming methods, they have been able to use less farmland than
in the past.
A. Equipped B. Having equipped
C. To be equipped D. Equipping
Only after I read the book _______ why she devoted all her life to medical work for
Chinese women and children.
A. I understood B. had I understood
C. did I understand D. I had understood
It is ______ to improve the working conditions for the construction workers.
A. worthwhile B. worth C. worthy D. worthy of
