You can never be________careful，the road is icy and slippery

want to ________ a pleasant visit, find out asmuch as possible about the manners and customs of your host country

He stood still in front of the shop window ______ he were thinking something.[ ]

Jack had feelingof excitement when hearing his article had been published in schoolmagazine．

50. Is there a gas station around _____ Ican get some petrol