He is' only a boy of three, but he can learn the poem ______heart.

—When can I call on you, afternoon or evening?
—________. I’ll be at home all the time.

Thai is the only way we can imagine _______the overuse of water in students' bathrooms.

This type of desk and chair can be adjusted ______the height of students at different ages.

The rule that only people above 21 years of age can drink ______.

The heating system of our apartment broke down so I made a ______ call to the community service center. 

It took several days to _______ the courage to call, but through the encouragement of my parents I called the church where she worked.

This type of MP4 is my favorite, but I can’t ________ it.

As a result of the serious flood, two-thirds of the buildings _______in the area.

According to the passage, a large number of children can be saved only when ______.

—What _____ the population of China?—One third of population _____ workers here.

I have an urgent problem and I need to call my parents, but I’m afraid I haven’t got ______ change—only a ￡10 note. Will you do me a ______ ?