_________ 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 |
I really appreciate_____ to help me, but I am sure that I can manage by myself.
| A．you to offer | B．your offering |
| C．it to offer | D．it offering |
Life in the city is quite different from _____ in the countyside.
| A．it | B．that | C．one | D．those |
---- How about your last weekend?
---- It was boring. I______ anything.
| A．can’t do | B．hadn’t do | C．haven’t do | D．didn’t do |
This book is said to be a special one, which______ many events that cannot be found in other history books.
| A．reads | B．writes | C．covers | D．prints |
The price of goods kept ______. We had to cut the expenses in order to meet our daily needs.
| A．standing out | B．going up | C．breaking down | D．putting up |