. The little boy is dirty from head to foot because he ___ in the mud all morning.
Large quantities of water , as well as some other timely help including a medical team, _____ since the serious drought hit Yunnan Province.
—How did it _____ that you made such a silly mistake?—I myself haven’t figured it out yet.
The company has launched several types of cars this year, and one_______ appeals to the young.
It is _______ of the students to stay up reading till late night before the final exam.
Considering the advantages of the method, they decided to it.