8.____ more attention,the trees could have grown better.

A.Given B.To give C.Giving D.Having given

9.___ from space,the earth with water ___70% of its surface looks like a "blue blanket".

A.Seen ;covered B.Being seen;covers C.Seeing;covering D.Seen;covering

10.____,the experiment will be successful.

A.If carefully doing B.If it done carefully C.If carefully done D.If doing carefully

11.The girl wrote a composition without ___.

A.ask B.asking C.being asked D.to be asked

12.He finished his homework and then went on ___me.

A.helping B.with help C.with helping D.to help

13.___where to go ,he asked a policeman.

A.Having lost his way and not knowing

B.Losing his way and didn't know

C.Having lost his way and didn't know

D.Lost his way and didn't know

14.____ her friend was badly hurt,she burst into tears.

A.Hearing B.Having heard C.To hear D.Heard

15.____ his team had won, his face lit up at once.

A.Knowing B.When knowing C.After knowing D.When he knew 

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