They usually have the medicine_______ before putting into the market all over the country.
| A．testing out | B．to be tested out |
| C．being tested out | D．tested out |
It's helpful to put children in a situation ________ they can see themselves differently.
| A．that D | B．when | C．which | D．where |
—What do you think of teacher，Bob?
—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
| A．where | B．which | C．when | D．that |
In some places women are expected to earn money ________ men work at home and raise their children.
| A．but | B．while | C．because | D．though |
There were some chairs left over ________ everyone had sat down.
| A．when | B．until | C．that | D．where |
—Are you ready for Spain?
—Yes，I want the girls to experience that ________ they are young.
| A．while | B．until | C．if | D．before |