I can’t________ what has happened to the vegetables for they were freshly picked this morning.
________ is often the case with old people, my grandfather is fond of doing morning exercise.
It hasn't been made clear ________ the new underground line is to be open to traffic.
What impresses me most is ________ he appears in front of others, he wears a sincere and charming smile.
It is announced that big prizes will go to ________ finishes the assignment on time.
The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them.