You can get the best result ________ youcarry out the experiment under the desired conditions

How much is this______—It’s two dollars.

Hi, Jack. Nice to meet you here in Taizhou!–Me too. But I _______ you were in Shanghai

It is common that many parents choose to rent a house near schools to _______ their children during their school years.

The supermarket tried hard to improve customer’s________ last year.— Yeah, they did it. A lot of people come here to buy things now.