A. unclear B. duck C. first-ever D. ambassador A. moreover B. rabbit C. remarkable D. acquisition A. on the weekend B. ask C. cat D. fireman A. convert B. monkey C. aerospace D. erase A. confused B. panda C. business D. apply A. African B. bird C. determined D. retell A. inconvenient B. bear C. celebrate D. wooden A. pig B. outside C. plug D. ozone layer A. unless B. mouse C. dragon boat D. fluctuation A. dog B. big C. drown D. rarity