从a、b、c、d四个选项中，选出可以填入空白处的最佳选项。
1. –i am so glad i caught you at home. i need your help!
–_______, robin?
a. what’s up b. what else c. how come d. why not
2. they did everything in their power to save the building dating back to the qing dynasty, but their efforts were _______.
a. in turn b. in time c. in vain d. in need
3. in the opinion of li ming, a science student in that high school, physics is_______ chemistry, but much easier than english.
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