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
