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)9,I had some problems________my homework.. A. to finish B. finishing C finishes D. finish ( )10,I learned _______ a bike at the age of eight. B. ride C to ride D rode ( )11,It’s important _______us_____English well. A to。 to learn C of。 to learn ( )12,We willgo to the Great Wall if it________ tomorrow. A not rain B isn’t rain C doesn’t rain D won’t rain ( )13,I can’t always make plete sentences,_________. A too B also C either D neither ( )14,I have trouble _____the math problem_______your help. A to work out。 without C working out。without ( )15,They found ______difficult to understand him. A. that B it C this D so ( )16,He found a number of people already___ there. A to work B working C w