—Why does        take Tom an hour to get home?— I don’t know. Maybe the traffic is heavy.

There is ___ food in the fridge(冰箱). Let’s buy some.

Jack is a boy, ______ last name is Brown.

--- What ________ useful book ! ---Yes, it is. But I found___________ difficult for me to read.

We should plant more trees on       sides of the street.