A visit to Sydney had long been my dream. So I was ____ (excite) when offered the opportunity to go. I arrived ____Sydney around 9:00 a.m. After ____(check) in a lovely apartment, I headed to the seaside and couldn't resist ____ (enjoy) the beauty of Sydney. Sydney is famous for its many beautiful ____ (beach). Among them, Manly, ____ is located on the north part of Sydney, is ____ (probable) the biggest one. If you go there, you can not only see the Manly Ferry from the Circular Quay ____ also enjoy very beautiful scenery of the Sydney Opera House and Harbor Bridge along the way. If you like surfing, Bondi Beach is a perfect place to go, although it is actually____(small) than Manly. Apart from the beaches, you can take a visit to the Royal Botanic Garden to admire the view of the harbor or visit the Art Galley to appreciate the works. You will find your interesting tourist attractions here. Definitely, Sydney is so ____ (fascinate) that it is worth going.

已知点M（1，a）和点N（2，b）是一次函数y=﹣2x+1图象上的两点，则a与b的大小关系是：a____b（填“＜”，“=”，或“＞”）

如图所示，电阻R₁标着“10 1A”，R₂标着“5  1.5A”，闭合开关S后为保证R₁、R₂均不损坏，则a、b之间允许加的电源电压不得超过（）