我国坚持改革开放已37年有余，党和国家仍不忘初心，提出全面深化改革，打好改革攻坚战。这是因为（    ）

①改革是社会发展的直接动力                                                     ②改革是我国必须长期坚持的一项基本国策

③社会主义制度还不成熟、不完善，存在着体制上的种种弊端       ④改革能够极大地解放生产力

⑴How many books do you have?  ____     A. I'm from America.

⑵How many ducks can you see?____        B. He's Mr Black.

⑶Can I use you pen?  ____                         C. I have sixteen.

⑷Where are you from?____                       D. I can see twelve.

⑸Who's that man?____                              E. No problem.