So carelessly _____ that he almost killedhimself

What an important part the Internet ______ in our lives!

－ are the keys－ on the table.

.Since we have failed many times, why nottake a new _________to solving the problem

(2014·湖南郴州五校第二次联考)It was during the Ming Dynasty________the Great Wall was repaired and extended to take on the appearance it has today.