A.To tell an interesting story. |
B.To introduce a surprising way to earn money. |
C.To solve a puzzling problem. |
D.To present an exciting research. |
A.chatting online |
B.advertising some products |
C.clicking on advertisements |
D.choosing green ticks or “x”s |
A.wasted. | B.spent. |
C.lost. | D.gathered. |