Only _____ our courage beats our fear ________________.
| A．when; can we succeed | B．if; we can succeed |
| C．because; will we succeed | D．while; we’ll be able to succeed |
Every individual _________ in a continually changing world of experience of which he or she is the center.
| A．exists | B．will exist | C．is existing | D．has existed |
_________ in Current Biology, the finding suggests that female birds seek mates with superior singing skills.
| A．To publish | B．Published |
| C．Having published | D．To be published |
-How is your new babysitter?
--We _________ ask for a better one. All our kids love her so much.
| A．couldn’t | B．might | C．mustn’t | D．should |
A cup of water _________ you will feel better.
| A．or | B．but | C．so | D．and |
Actually girls can be _________ they want to be just like boys, whether it is a pilot , an astronaut, or a general manager.
| A．wherever | B．whoever | C．whatever | D．whichever |