______ the problem whether men with cats would be more than attractive than men on their own, the researchers carried out two surveys to find the truth.

(单选题)The man hid himself behind the door waiting ______ no other (单选题)—When the Americans objected to this, what did the British d (单选题)Much work is needed to ensure that by 2020 the percentage of (单选题)Alipay, which currently has over 520 million users, is a pow (单选题)—David has been ______ since he got the offer in this compan (单选题)The best book are treasuries of good words and golden though (单选题)—I didn’t go swimming yesterday. What about you?—______, bec (单选题)______, British scientist Steven Hawking opened an account o (单选题)The book was so interesting that he had read it for four hou (单选题)Please choose a person to ______ your group to take part in