11.I am determined to do what I can ________ my English.A.im

11.I am determined to do what I can ________ my English.A.improve B.raise C.to raise D.to improve
12.Tom kept quiet about the accident ________ lose his job.A.so not as to B.so as not to C.so as to not D.not so as to
13.The boy's eyes need ________ with great care.A.to examine B.examined C.to be examined D.to be examining
14.—Was the work difficult?
—Not at all.It was easy ________ .
A.to do B.to be done C.doing D.to have done
15.—Was he preparing for the exam yesterday evening?
—Yes,he's ________ it next month.
A.to give B.to take C.to make D.to do