I'll come to see you if _____.
| A．you're convenient | B．it is convenient for you |
| C．you feel convenient | D．it is convenient with you |
_______ from the top of the mountain, we found the city more beautiful.
| A．Seen | B．Having been seen | C．Seeing | D．Being seen |
Do you know the stages every inventor must ________ before they can have their invention________ .
| A．go through; approve | B．go through; approved |
| C．get through; approval | D．look through; approved |
The dodo became extinct fairly recently so its DNA is still ________ .
| A．in good condition | B．in good state |
| C．in good conditions | D．out of a condition |
Exactly when the first people arrived in ________ we now know as California, no one really knows.
| A．which | B．what | C．that | D．it |
The patent officer ______ with my file explained to me that a plant variety is not a/an _______ invention as it is a result of adjusting growth scientifically.
| A．dealing; abrupt | B．dealt; innocent |
| C．deals; practical | D．dealing; valid |