1. John is collaborating with Mary in writing a book.
A） cooperating
B） merging
C） combining
D） associating
2. Mary lost control of her car and collided with a tree.
A） came across
B） ran into
C） met
D） knocked
3. Mary was compelled to take in washing to help support her family.
A） pleaded
B） appealed
C） forced
D）instructed
4. The child couldn't comprehend the advanced textbook.
A） interpret
B） read
C） understand
D） translate
5. I warned him to keep the matter confidential.
A） private
B） safe
C） personal
D） secret
答案：A、B、C、C、D