Ⅰ.单句语法填空
1．Well，we have been finding (find) the bones of tigers and bears in the caves，and we think these were their most dangerous enemies.
2．He has been writing (write) a novel，which will be finished next month.
3．The little boy is dirty all over because he has been playing (play) in the mud all the morning.
4．He has been lying (lie) in bed for two weeks because of his broken leg.
5．You know，I have been looking (look) for a job for three months，and this is my first formal interview.
