下列句中加点词的解释，不正确的一项是（　　）

Great changes ______ in the past few years, and a lot of factories ________

hehas the ______ actively to get near us because he has no little friends to playtogether with

Jim told us all that _______ he said at the meeting was right.

I won’t tell the student the answer to the math problem until he on it for more than an hour.