选出下列每组词语中与其他两项不同类的一项。（{#blank#}1{#/blank#}）1. A. by ship B. by plane C. go home
（{#blank#}2{#/blank#}）2. A. hospital B. museum C. helmet
（{#blank#}3{#/blank#}）3. A. on foot B. turn left C. turn right
（{#blank#}4{#/blank#}）4. A. stop B. sled C. wait
（{#blank#}5{#/blank#}）5. A. must B. often C. sometimes
