When it comes to “empty-nest syndrome(综合症)”, parents are advised to _______regular contact with children through phone calls, emails, texts or video chats. 
#12127
A
substitute
B
sacrifice
C
associate
D
maintain
推荐题目
 He is out of work, feeling as if he has _________ nothing.
#12120
A
established
B
accomplished
C
abolished
D
guaranteed
—How much is the T-shirt  ___________? —65 dollars
#13844
A
worth
B
cost
C
worthy
D
worthwhile