It’s clever________ Amy to make a birthday cake, but it’s hard _____ me to do that.

29—Shall I call you at 6 a.m., Toby?—No, not that earlyI ____

Carbon dioxide ___ from burning fuels isthe most common of the so-called greenhouse gases.

26The famous writer as well as his wife and daughter_____saidto______our party，butso far they_____

This custom the seventeenth century.