— I have got a headache.
— No wonder. You in front of that computer too long.
| A．work | B．are working |
| C．have been working | D．worked |
-Do you like ___ here?
-Oh，yes. The air，the weather，the way of life. Everything is so nice.
| A．this | B．these | C．that | D．it |
I like ____ in the autumn when the weather is clear and bright.
| A．this | B．that | C．it | D．one |
It was at four o'clock in the afternoon ____ he and his grandpa reached the museum in Guanghan.
| A．while | B．that | C．when | D．as |
I consider____ my duty to help you．
| A．it | B．this | C．that | D．its |
Is＿possible to fly to the moon in a spaceship?
| A．now | B．man | C．that | D．it |