3.29. A. aiming B. looking C. waving D. pointing

A. 　 what

B. 　 which

C. 　 why

D. 　 when

A. 　 discovering

B. 　 returning

C. 　 borrowing

D. 　 making

A. 　 that

B. 　 when

C. 　 who

D. 　 where

A. 　 reusing

B. 　 reused

C. 　 reuses

D. 　 to be reused

A. 　 century

B. 　 battles

C. 　 thing

D. 　 years

A. 　 hardly

B. 　 almost

C. 　 much

D. 　 far

A. 　 bright

B. 　 weak

C. 　 soft

D. 　 natural