61 Sam            with his friends every weekend.

A. skates     B. is skating       C. has skated      D. was skating

62. In china, the weather in the north is different from         in the south.

A. it   B. one     C. that      D. those

63. Kate’s mother was         about her safety.

A. anxious    B. curious      C. frightened       D. confident

64. .It             48years since China got its seat back and was able to rejoin the United Nations.

A. was      B. will be      C. had been      D. has been