根据句意，在句子空白处填入适当的词。(每空限填一词)

1．Be         when you cross the street．

2．There are forty students here，twenty-three of them aye gifts，        are boys．

3．I have been here for then years          last year．

4．Your sister           plays basketball，does she?

5．“It’s raining heavily．”“          it is。”