This is a(n)　　arrangement,not a permanent one.

－Linyi has changed a lot in the past few years.－Yes. You can see a lot of buildings, trees on ________ sides of the streets.

Mum, this is my English teacher, Mr Wu. —____________________, Mr Wu.

______, we should sleep at sleep at least 8 hours a day, but in practice we sleep less than that.

Amy is ______ a careful girl that she made ________ mistakes in her last exam.