从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
(   )1. Do you usually study _______ the textbooks?
A. with reading    B. from reading      C. by reading      D. to read
(   )2. I have got used _______ in this city. What about you?
A. to live     B. of living    C. of live    D. to living
(   )3. We are proud _______Chinese.
A. of being         B. to being
C. being         D. have been
(   )4. —What’s wrong with you?
         —I am having trouble _______ English.
A. of learning       B. to learn
C. in learning       D. learn
(   )5. Parents shouldn’t be too strict _______ their children.
A. at            B. with         C. in           D. for
(   )6. Don’t worry _______ your English. I can help you _______ it.
A. about; with      B. for; with
C. for; on         D. about; on