you are slipping away

step outside and you could break a leg slipping on your doormat
翻译

.急ing
十 选择填空
( ) 1.Father came ______ Sally was slipping on the floor.
A.while B.just as C.when D.as
( ) 2.I am a student,______?
A.isn’t I B.am I C.aren’t I D.don’t I
( ) 3.Comrade Chang did quite well,he made very ______mistakes.
A.a little B.a few C.little D.few
( ) 4._____ the typewriter to the next room,and ____ the recorder here.
A.Bring,take B.Take,bring C.Carry,take D.Bring,carry
( ) 5.As you are ____ insistent person,I will go with you.
A.so B.such C.a so D.such an
( ) 6.The men _____were all engineers.
A.which I talked B.to those I talked C.those I talked to
D.I talked to
( ) 7.Your book is on the floor.___________---
A.Pick it up!B.Put up it!C.Pick it!D.Take up it!
( ) 8.There are only _____cigarettes in the box.I have
too____ time to buy any today.
A.a few,little B.a little,few C.a few,a little
D.a little,a few
( ) 9.I would like to ___to your English teacher if he is not too busy now.
A.ask B.tell C.say D.talk
( ) 10.Harry hasn’t passed in the exam.___Dick.
A.So has B.Neither has C.Either has D.Nor is
( ) 11.“Don’t eat too ____ before going to bed” Mum said to me.
A.many B.much C.few D.lot
( ) 12.Please don’t say anything that might ____ her feelings.
A.injure B.hurt C.wound D.damage
( ) 13.The little boy____ his pencil everywhere,but he couldn’t_____it.
A.was looking for,find B.was looking after,find
C.was finding,look at D.was finding,look after
( ) 14.Li Yin is not _____ today.She is ill.
A.good B.well C.better D.best
5.I have done my homework yesteray.___________
6.A number of students is there.___________
7.Here are two books.Which one do yo like best?___________
8.It is old enough for the boy to go to school.___________
10.Between you and he,there is a difference.___________
11.They are talking each other.___________

Step outside and you could break a leg slipping on your doormat.请问其中的slipping是什么作用?
slipping on your doormat 是什么成分?
这是什么句法