Trees are useful to man mainly in three ways, the most important of which is that they can protect ______ from droughts (干旱) and floods.
The Chinese teacher often requires the students to talk about writers and books________they like most.
John is a creative person. He can often_____ideas that are surprising to his classmates.
My father told me that he ________ me some gifts when he returned from America the next week.
The cake is delicious. May I have ________ one?
John seems puzzled about ________ the question meant.