How long do you suppose it is ________he arrived there?
| A．when |
| B．before |
| C．after |
| D．since |
In ________ distance is a tall tree which is said to have ________ history of over 500 years.
| A．the；/ | B．/；/ | C．a；a | D．the；a |
Believe it or not , that is _____ people call the sixth sense.
| A．when | B．which | C．why | D．what |
What I want to know is ____ he likes the gift given by us.
| A．that | B．if | C．whether | D．不填 |
I like _____ in the autumn when the weather is clear and bright.
| A．this | B．it | C．that | D．one |
----Could I use your computer for a few moments, please?
-----______.I’m not using it myself.
| A．Go ahead | B．Come on | C．Take care | D．Hold on |