区别税制结构类型的主要标志是（)。

Jack sat down in front of the visitor because he wanted ______.

A．to see the visitor

B．to show the visitor how clever he is

C．the visitor to leave

Jack was ______.

A．strong enough to move the family piano

B．not strong enough to move the family piano to the living room

C．too strong to move the family piano to the living room

D．strong but he couldn't move the family piano to the dining room

He ______ secretly into his wallet to see if he had enough money to pay the bill.

A．peer

B．gape

C．gaze

D．stare

A、the doctor tells Jack that he is seriously ill

B、Jack tells the doctor that he is running a high fever

C、the doctor wants to see if Jack’s lungs are all right

D、Jack tells the doctor that he’s hurt his body badly

—Did you see Jack at the wedding party？ —No, he ______ by the time I ______ there.

A．had left.., got

B．left.., had got

C．has left.., got

D．left.., got

He was tall enough (see)__________ over the heads of other people.

Jack didn't see the steps in the dark, so he ______ down.

A．fell

B．had fallen

C．would fall

D．was falling

If you (happen) to (come across) Jack, please tell him (to come) and see me when he (will be free).

A．happen

B．come across

C．to come

D．will be free