Government should adopt laws that would banadvertising and other types of ______ of tobacco products.

When he ______ the door, he found his keys were nowhere.[ ]

With no one to________ in such a frightening situation，she felt very helpless.

How was your recent trip to Sichuan—I’ve never had ________ one before.

told me in a phone call that she had written to me a week before, but I haven’treceived__________