The voyages of travellers before the 17th century show that they were not ________ the sea even though they didn’t have modern navigational aids[ ]

_____ at the theatre，he found the ticket his friend gave him was left at home.[ ]

________．How can I get to the bank—Just go straight and you can find it.

We called the First-Aid Center ____ the traffic accident happened

Thank you very much for everythingYou’ve been so helpful— Just let me know if there is anything else I can do for you