hrough Africa, the infectious disease jumpingfrom children to adults killed 1,000 people

Are you worried about the coming exam?—Only ______

The boy is tall enough _____ his age. –Yes, I was much _____ when I was his age.

I can’t find my mobile phone anywhere. —You _____ have lost it while eating out.

China has warned America that it_______ be responsible for its arms sale to Taiwan.