11. There are signs ________ restaurants are becoming more popular with families.

A) that B) which C) in which D) whose

12. I think I was at school， ________ I was staying with a friends during the vacation when I heard the news.

A) or else B) and then C) or so D) even so

13. It is said that the math teacher seems ________ towards bright students.

A) partial B) beneficial C) preferable D) liable

14. In order to show his boss what a careful worker he was， he took ___ trouble over the figures.

A) extensive B) spare C) extra D) supreme

15. Everybody ________ in the hall where they were welcomed by the secretary.

A) assembled B) accumulated C) piled D) joined

11-15 AAACA