(2013·高考浙江卷)There are some health problems that，when ________ in time，can become bigger ones later on.

It is____to trave by air than by water.

_______ fine day! Shall we go for a walk—That sounds great!

Much to my _____, the student has come torealize the importance of honesty.

Jim has many hobbies, ________ swimming, hiking and playing badminton.