As is known to us all, _____ tiger is in _____ danger of becoming extinct.
With the address I had no ______ in finding Mr. White’s house.
She bought with her three friends , none of______ I had ever met before .
As we all know , reading is to the mind______ food is to the body.
________my mathematics is very poor. Don’t worry . I’ll help you________ I can.
_________matters most in learning English is enough practice.