There is someone knocking at the door.- It ______ be Jimmy, he has gone to ShangHai .
“Helpto some . “He says to the children.
It is to teach a kid the way to solve problems than to tell him the solutionsdirectly.
What ________ useful book ! —Yes, it is. But I found___________ difficult for me to read.
_________ homework, most students do it every day. [ ]