That is __________ the problem lies.

, which of these smart kids do you like best in last night’s TV show— ________ . They are all proud and selfish.

I have been in China 1997.

y dived into the water and after ______ seemedto be a long time, he came up again.

Stephen Hawking believes that the earth is unlikely to be the only planet ___________ life has developed gradually[ ]