There are so many kinds of computers in the shop. I really don’t know ______ to choose.

The whole world is undergoing the biggest financial crisis nowadays, ____ calls for international cooperation among all nations to get over.

Sally is very happy. There is a big smile ______ her face. [ ]

Is this your schoolbag? – No, it isn’t. Ask Bill. He is looking for_______.

David usually takes _______ walk for an hour after dinner.