Some university students carried out a campaign     1     they celebrated their whole day without cell phones This move was     2     (improve) their relationships with their near and dear ones and to keep them away from the virtual life. Studies indicate that a majority of young people use their phones during lessons, over family meals or even at the cinema. The problem of phone addiction has been observed since a few years ago, with experts and psychologists     3     (try) to increase awareness about this problem.

Nowadays, we     1     (reach)a period when science and technology are highly developed. In 2016, a new App, Tik Tok, came into being,     2     can help people share interesting things with others.     3     , more and more teenagers are so crazy about Tik Tok that they are lost in it. There is no doubt that Tik Tok has a negative     4     (affect)on our teenagers.

    5     (lucky), the Chinese version of Tik Tok is introducing a “teenage mode” which will limit the amount of time children under     6       age of 14 spend on the short-form video app     7     40 minutes a day. It`s suggested that all Douyin users under 14 register for the app by using     8     (they)real names. Besides, Douyin will also be unavailable to those teenagers between 10 p. m. and 6 a. m. to protect their physical and mental health.

Actually,     9     (limit)teenagers` usage of Douyin will also push other Internet platforms with short video contents     10     (take)similar measures.

Are boys really better at math than girls？ No， that doesn't seem    1    （rely）．

That's according to new research by Jessica Cantlon， a professor and neuroscientist of Carnegie Mellon University， and her colleagues．    2    （scientist） looked at young boys' and girls' brains， and found no difference in mathematical ability． Their new paper，    3    （publish） in the journal Science of Learning， suggests that society is to blame    4    the mistaken idea that girls aren't good at numbers．

Cantlon and her colleagues used an MRI machine    5    （examine） 105 kids' brains while the kids watched an educational video．    6    found that the kids' brains showed no major differences during the experiment．

This report    7    （base） on a previous study in 2018，   which looked at the test performance data of 500 boys and girls． The 2018 paper found no difference in their early mathematical ability，    8    （suggest） that boys and girls are equally equipped to reason about mathematics during early childhood．

Cantlon hopes that people will stop being so sexist （性别歧视的） about little girls and calculators．"    9    （hope）， we can change expectations of    10    children can achieve in mathematics，" she says．