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 |
Home is ________ somebody notices when you are no longer there.
| A．that | B．when |
| C．how | D．where |
—Mom！Jack has broken a cup！
—Doesn’t matter. Accidents ________ happen.
| A．should | B．must |
| C．will | D．Shall |
The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
| A．until | B．though |
| C．because | D．Unless |
You are hardworking and surely most of you _____ a college admission notice by the end of September this year．
| A．will receive |
| B．will be receiving |
| C．will be received |
| D．will have received |
I _____ through the hard time but for my teacher’s generous and timely help．
| A．couldn’t have gone | B．could go |
| C．mustn’t have gone | D．hadn’t gone |