我国少数民族主要分布在（    ）

根据句意及首字母提示，在空白处填入适当的单词。
(1)—How often does Jim go to the library?—He goes to the library o____  a week.
(2)W____  comes after Tuesday.
(3)There is a soccer game b____  Class 3 and Class 4 on the playground at 4:30 p. m. on Friday.
(4)—Do you like l____  to music?—Yes, very much.
(5)—Where is John now?—He is w____ a letter in the classroom.

今天山东文化传媒栏目多以“齐鲁××”名，而河北各栏目则以“燕赵××”定名，这源于西周实行的（    ）

原子是由原子核和 ____构成的