往事已成空，还如一梦中

let me see how many students are like me

allow me introduce myself

are you there?

as soon as possible

be careful

call me back

can I ask you something?

can I come tomorrow? can you explain that again?

choose what ever you want

can you follow me

I'm sorry.may I ask you a question?

what are these?

what does it say?

what is this thing

I assure you

I've had enough

it touched me

time is money

what's matter with you

are you sure

I did it

it's my lucky day

go and see

they are over there

let me see

what's your problem?

are you going there?

very much