（1）在下列物质①NH₃、②BF₃、③HCl、④SO₃，属于非极性分子的是（填序号）　 ____　．

（2）试比较含氧酸的酸性强弱（填“＞”、“＜”或“=”）：HClO_{3 ____}HClO₄．

（3）根据价层电子对互斥理论判断：H₂O的VSEPR构型为 ____．

（4）沸点比较：邻羟基苯甲醛 ____对羟基苯甲醛（填“＞”、“＜”或“=”），原因是 ____

—It's going to be tough, but we all expect he will be likely to ________.

A.You can get there by sharing-bike.

B.What kind of public transportation (交通工具) is near your flat?

C.can you give me a little more information about your flat?

D.I'm not sure. If you check online, you can get that kind of information.

E.I'd rather take a taxi.

F.Is there a train station near here?

D.Good luck with your search.

Mike is a new comer in the city. He is looking for a flat. He is talking with the owner of a flat on the phone now.

Mike: Hello, this is Mike.____ Walt:  Sure, what can I help you with?

Mike:____

Walt: There is a bus stop about two blocks (街区) away. Mile:  Do you know what direction that bus travels?

Walt：____

Mike: Okay, I'll just go online. Walt:  ____

Mike: By the way.is there a shopping center around your house? Walt:  Yes, there is one a few stops away____

Mike: Thank you very much