11.    I hurried to the booking-office only _______ that all the tickets ______ out.
A. to tell ; sold               B. to be told ; had been sold
C. telling; had been sold       D. told ; was sold

12.    ------ This is such an interesting book ______ everyone likes to read .
------Yes , but there are few such books _______ in the bookstore now .
A. that ;present               B. as ;convenient
C. as , available               D. that ; available