Those who have ______ floods and sandstorms know the importance of environmental protection.
The children are dirty from head to foot because they ________ in the mud all morning.
The media today can draw public attention to _______ medical help is actually needed.
_______ they said about my program was a real knock to my self-confidence.
___________ in hard seats for 6 hours, we finally stepped out of the train tiredly.
Our house is on the top of the hill, and in winter the winds ________ be very cold.