\(S=\frac{1}{2}-\frac{2}{3}+\frac{3}{4}-\frac{4}{5}+\frac{5}{6}+\frac{4}{5}-\frac{3}{4}+\frac{2}{3}-\frac{1}{2}\)

\(\Rightarrow S=\left(\frac{1}{2}-\frac{1}{2}\right)+\left(\frac{3}{4}-\frac{3}{4}\right)-\left(\frac{4}{5}-\frac{4}{5}\right)-\left(\frac{2}{3}-\frac{2}{3}\right)+\frac{5}{6}\)

\(\Rightarrow S=\frac{5}{6}\)

Charlie Chaplin waas the most famous_________of the silent film.

A. star B. plot C. acting D. scene

2. __________being frightened by the images, Lan still liked the film so much.

A. Because B. Despite C. Although D. Nevertheless

\(A=1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9\)

\(A=2\times\left(1+9+2+8+3+7+4+6+5\right)\)

\(A=2\times\left(10+10+10+10+5\right)\)

\(A=2\times45=90\)