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