Our research has focused on a drug which is so _____ as to be able to change brain chemistry.
The plan has to be _______ to meet the real situation.
I ______ my university professor in the supermarket near my house, which was out of my expectation.
To qualify yourself for this kind of new job, I recommend that you ________ some online courses.
________ I can see, there is only one way to solve this problem.
. It is the first time that I _____ abroad. A. have been B. was B. will have been D. am