He is so busy with the research he has no time left for any other activity.

排列下面几个句子，组成语意连贯的一段话，衔接最恰当的一项是( )人的眼中、心里，总有一个前方。________因此，这世界上就有了路。①他们仿佛从苍茫的前方，听到了呼唤他们前往的钟声和激动人心的鼓乐。②这种不确定性，反而助长了人们对前方的幻想。③前方使他们兴奋，使他们行动，使他们陷入如痴如醉的状态。④他们不知疲倦地走着。⑤前方的情景并不明确，朦胧如雾中之月，闪烁如水中之星。

The hotel has been enlarged; ____, its service is improving.

c. don’t have toD. needn’t to

(2013·陕西，20)It remains to be seen ________ the newly formed committee’s policy can be put into practice.