Scientists say it may be five or ten years________ it is possible to test this medicine on human patients.[ ]

A good advertisement should ____ the consumers and direct their attention to the product.

I would rather you ____ it.

How are you today ?——–Oh, I ______ as ill as I do now for a very long time

the works of Leonardo da Vinci, theLouvre Museum has more than 6,000 other European paintings, ranging fromthe13th century to the 19th century.