My sister has some trouble ______spelling some of the words in American English, while I have some difficulty ________ my pronunciation．

Though the “No smoking” signs have existed for long in public places, heavy smokers often ________ them and light up cigarettes.

Tony can hardly boil an egg，still________cook dinner.        

The reporters of all the leading newspapers ________ the trade talks between China and the United States.

Despite the fact that all three teams ________ different approaches to the problem, they were all immediate successes．