1 correct

2 right

3 not bad

4 pretty good

1 to open

2 to show (a ticket)

3 to turn on

4 to switch on

1 surname Cuo

1 to miss (train, opportunity etc)

1 to open

2 to start

3 to turn on

4 to boil

5 to write out (a prescription, check, invoice etc)

6 to operate (a vehicle)

7 carat (gold)

8 abbr. for Kelvin, 開爾文|开尔文[Kāi ěr wén]

9 abbr. for 開本|开本[kāi běn], book format

1 one man can hold the pass against ten thousand enemies (idiom)

1 One key opens one lock.

2 There is a different solution for each problem. (idiom)

1 to speak without thinking (idiom)

2 to blurt sth out

1 to start sth new or original (idiom); to break a new path

2 to break fresh ground

1 uneven and jumbled (idiom); irregular and disorderly

2 in a tangled mess