用所给词的适当形式填空.（10分）

小题1:He is very lazy.He _________his homework every day. ( not do )

小题2:Lucy _________ the piano when I went to see her last night. ( play )

小题3:Listen! Someone            (cry) in the next room.

小题4:He told me that the sun       (rise) in the east.

小题5:We’ll go to the beach if it            (not rain)tomorrow.

小题6:     ( not be ) late for school.

小题7:The short play             (write) by Lu Xun in 1932

小题8:My mother went out an hour ago.she            (be)back in half an hour.

小题9: you      (finish)your work? —— Not yet.

小题10:Li Ming       (read ) this book two days ago.

（4分）在下列化合物中：① H₂O，② Na₂O，③ I₂，④ NaCl，⑤ KOH，⑥ CO₂，⑦ NH₄Cl，⑧Na₂O₂，请填空（用序号表示）：

（1）只由非金属组成的离子化合物是                           ，

（2）含有极性共价键的离子化合物是                          ，

（3）只含有非极性共价键的是                                ，

（4）既有离子键又有非极性键的化合物是                      。