11.His visit to London last spring is ______ as a great success.

A.looked into

B.looked to

C.looked over

D.looked upon

12.You will complete your project more easily if you take ______ of all the facilities here.

A.privilege

B.advantage

C.chance

D.care

13.Seventy guests had been invited to the party,but only fifty ______.

A.turned around

B.showed up

C.turned out

D.showed off

14.All we can do is to hope this chemical plant will take ______ to reduce air pollution.

A.measures

B.ways

C.positions

D.methods

15.She was just too busy yesterday,______ she would surely have gone there with you.

A.however

B.for

C.therefore

D.otherwise