After he failed the exam, he tried his best to ____ and then made a proper plan. A.gather his thoughts B. collect his ideas C. use his thoughts D. collect his thoughts
—Could we stay here for the night? —Sorry. I have ____ to hold you all. A. too small a room B. very small a room C. a too small room D. such small a room
The students _______ busily when Miss Brown went to get a book she _______ in the office. A. had written, left B. were writing, has left C. had written, had left D. were writ
)2+(y+1)2=1-
k2,
k2＞0,即k2＜
.
-1)2+(-1-2)2＞1-
k2.
＜k＜
.
＜k＜