Our research has focused on a drug which is so _____ as to be able to change brain chemistry.
(2012年福建卷,29)You had better ________ some time every day for sports so that you can keep yourself energetic.
I've always longed to visit China,and now my dream has________.
Suddenly the truck was out of control and________ a tree.
The tower ________very old ________ the Ming dynasty.
It just doesn't ________—why did you do such a thing!