请你从所给的A、B、C三个选项中，选出可以填入空白处的最佳选项，并将其字母标号填入题前的括号内。

（    ）16. ―Does your grandfather enjoy talking to his old friends by QQ?

―No. he always talks ______ the phone.  

A. at                              B. in                                      C. on

（    ）17. P aul can play ______ tennis but he can’t play______ drums. 

A. the; the                           B. /; the                               C. the; /

（    ）18. One ______ boy helps me cross the river.

A. 16-year-old                            B. 16-years-old                C. 16 years old

（    ）19. That baby koala is______ interesting. I like it very much.

　　       A. kind of                          B. a kind of                        C. all kinds of

（    ）20. Look! The sign “______”. It says you mustn’t smoke here.

           A. No tal king                      B. No eating                        C. No smoking 

（    ）21. Ann often helps me ______ math after school.

A. for                                   B. by                           C. with

（    ）22. The pandas are cute and ______. So we must keep quiet.

A. shy                            B. scary                        C. lazy

（    ）23. Victor wants to find a new_____, He doesn’t like to _____here.           

A. work; job                   B. job; works                C. job; work

（    ）24. He can’t finish the homework. He ______ needs more time.

           A. either                        B. just                          C. still