My elder brother wants to buy a _____ computer, so that he can carry it around when he travels.

You can see the stars on a clear night, but in the daytime they are _____

 —The weather is not good enough for an outing， is it？　　 —Not in the least. We have not have ______ at this time of the year.

It was really a       experience. Afterwards everybody was very       .

In the meantime, the question facing business is whether such research is   the cost.