—Steve is good at writing short stories. — So he is. But he writes _______ than us. So he can’t get good grades in writing. 

Curious about the world around him, my son__   __ask me endless questions when he was young．

—By       local farmers, we hope        them improve their lives.—I think it’s a good idea. 

(2013·长沙二模)—The research on the new flu virus vaccine is challenging  and demanding.Who do you think can do the job?—________ my students have a try?

Helen ____ go on the trip with us, but she isn’t quite sure yet.