Jane _____ these families of chimps for many years and helped people understand how much they behave like humans.
| A．had studied | B．studied | C．studies | D．has studied |
.—Do you need any help, Lucy?
—Yes. The job is ____ I could do myself.
| A．less than | B．more than | C．no more than | D．not more than |
I'm afraid this painting is not by Picasso. It's only a copy and so it's _____.
| A．priceless | B．invaluable | C．unworthy | D．worthless |
—Was Martin sorry for what he had done? —_______. It was just like him.
| A．Never mind | B．All right | C．Not really | D．Not surprisingly |
Maria _____ missed the first train so as to travel on the same one as John.
| A．deliberately | B．intensively | C．decisively | D．objectively |
These plastic flowers look so _____ that many people think they are real.
| A．beautiful | B．natural | C．artificial | D．similar |