It is obvious to the students ______ they should get well prepared for their future.
The step you have taken is ________ much risk(冒险).
We've always known him ________ a warm but calm character.
Now that he has missed his ________, he'll have to wait for the next round.
— Were you worried about him last night? — Yes. It was ________.
.These are all ________houses for the homeless.