She now has to return home to have a long-time rest at her young age, because her health _____ under the great pressure of work.
Danby left word with my secretary ________ he would call again in the afternoon.
Do you have any ideas ________ is actually going on in the classroom?
Elephants have their own way to tell the shape of an object and ________ it is rough or smooth.
I was surprised by her words, which made me recognize ________ silly mistakes I had made.
The poor young man is ready to accept ________ help he can get.