Hong Kong Disneyland is well worth _____.
to visit
visited
visit
visiting
句意：香港迪士尼乐园值得参观。be worth doing 值得做，故选D。
The problems are difficult to solve. Please give me _____.
many advice
some advice
an advice
some advices
考查名词的数。句意：这些问题很难解决。请给我一些建议。advice为不可数名词，本身无单复数变化，不能用不定冠词a/an修饰，也不能用many修饰，故选B项。