D

\(-\dfrac{6\sqrt{2}-\sqrt{\left(9-8\sqrt{2}\right)\cdot2}}{2}\)

A

C

897

1. school year/ Vietnam/ begin/ Septemper

⇒ School year in Vietnam begins in September.
 2. elemenlary/ school day/ last/ 7:30 A.m/ 1:00 p.m

⇒ Elementary school day lasts from 7:30 am to 1: 00 pm.
 3. children/ often/ wear/ uniform/ sit/ bench/ behind/ wooden desk/ small porcelain inkpot/ cornec

⇒ The children ofien wear uniform and sit in the benches behind the wooden desk and small porcelain inkpot of the corner. 
 4. schoolgirl/ often wear/ white dress/ boy/ wear/ white shirt/ read kerchif

⇒ Schoolgirls often wear white dress and Schoolboys wear white shirt with a red kerchif.
 5. window/ rural school/ often/ have no panel

⇒ Windows in rural schools often have no panel.

C

1. to travel

2. haven't seen

3. goes

4. hearing

1B

2D

3A

4D

5D

6C