—Jane, have you finished yourpaper?
—No, I my sister with her homework all the morning.
| A．help | B．have been helping | C．helped | D．was helping |
How long ____ to finish the work?
| A．you’ll take | B．you’ll take it | C．will it take you | D．will take you |
____ four years since I joined the Army.
| A．There was | B．There is | C．It was | D．It is |
The climate of Shanghai is better than ____ of Nanjing.
| A．that | B．it | C．which | D．what |
We think ____ our duty to pay taxes to our government.
| A．that | B．this | C．its | D．it |
____ will do you good to do some exercise every morning.
| A．It | B．There | C．Those | D．You |