£¨ £©1. _____should not be allowed to go out at night.

     A. Twelve-year-old         B. Twelve-year-olds

     C. Twelve year old         D. Twelve years old

£¨ £©2. I need time_____ my computer.

     A. to mend   B. mending   C. mend   D. mended

£¨ £©3.I had a little trouble        English grammar.

A. learn   B. learned   C. learning   D. to learn