中国大学MOOC: Over-texting results in many problems among the young, such as lack of sleep, illiteracy, and overeating.

Generally speaking, no one notices that you're texting back and forth with your friends in the office.

--Why were you so angry with your daughter? A: texting B: to text C: text D: texted

It is common for college students ________ their parents every day. A: to text B: to be texted C: to texting D: to have texted

How much time did Reilly typically spend on texting and calling every day before he started the Amish Project?

I have warned you not to do that __________. A: over and over B: over and over again C: again and over D: again and again over

求函数$y = {{1 + \root 3 \of {{x^2}} - \sqrt {2x} } \over {\sqrt x }}$的导数$y' = $( ) A: $ {1 \over 2}{x^{ - {3 \over 2}}} + {1 \over 6}{x^{ - {5 \over 6}}}$ B: $ - {1 \over 2}{x^{ - {3 \over 2}}} + {1 \over 6}{x^{ - {5 \over 6}}}$ C: ${1 \over 2}{x^{ - {3 \over 2}}} - {1 \over 6}{x^{ - {5 \over 6}}}$ D: ${1 \over 3}{x^{ - {3 \over 2}}} - {1 \over 6}{x^{ - {5 \over 6}}}$

A dog was _______by a bus and killed. A: turned over B: knocked over C: run over D: got over

Don't hand in your papers until class______. A: is over B: was over C: are over D: will be over

please choose the right sentences from the following. A: Since I got my smartphone, I spend too much time texting my friends,I hardly ever send emails anymore. B: Since I got my smartphone, I don't email my friends, I spend too much time texting them. C: Hardly do I email my friends since I got my smartphone. D: Since I got my smartphone, I hardly send emails.Instead, I spend too much time texting my friends.