It is reported that the scientists in our country are_______all possible way to control H7N9 flu.
.—Jack fell off a ladder yesterday,but he’s all right. —He’s lucky;he _________ himself badly.
.The boys started the song,and then the girls _________ in a loud voice.
The sports meet has been _________ because of the thick fog,so we’ll have our lessons in our classroom.
Everyone passed the exam.It _________ difficult.
.Beginners of English can _________ quite well without learning any grammar rules.