(2013·南昌三中模拟)—Do you think Jack will lend us a hand?—He is the last one to help others. He ________ lend his hand, though.

It    be difficult to get a train ticket during traditional Chinese Spring Festival this year because there are many ticket windows.

(2013·成都一诊)Parents are doing all they ________ to help their children achieve their ambitions.

—To make our city more beautiful, rubbish         into the river. —I agree.

--- Will you take up teaching as a career after graduation? --- Hard to say. I _______ go abroad for higher education instead.