(2013·浙江，9)When the group discussion is nearing its end，make sure to ________ it with important points.

—Do you know why Lisa cried in class？—I don't know and I don't ________.

 Our English teacher often tells us that the meaning of a new word may be   ________    according to the given context.

The protesters _______ the meeting by singing and shouting.

(2013·四川省六校二模)Jack is an outgoing child, usually kind and helpful, but he ________ lose temper sometimes.