On my way back, I paid ________ my friend Jack.

[　　]

—I usually go there by train.

—Why not ________ by boat for a change?

[　　]

Mr. Li, ________ come to my house for dinner this evening.

[　　]

The teacher got up from his seat, ________to the blackboard and wrote some words on it.

[　　]

He is ________ at the desk .

[　　]

A．seating 　　B．sitting

He ________ himself at the desk .

[　　]

A．seated 　　B．sat

I' m afraid I must be off now . It' s time I ________ to work .

[　　]

A．go 　　B．should go

It’s very clever ________you to do so.

[　　]

affair

[　　]

examine

[　　]