题目内容：

阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

China 1.(launch) a national cloud learning platform since Feb.3 and started broadcasting primary school classes 2.(make) sure the country’s 180 million students can still keep learning even though schools are closed, according to state-run news agency Xinhua. A new school semester,3.(schedule) to start today, has been postponed indefinitely as part of4.(measure) to combat the coronavirus. China authorities have encouraged people to stay at home to help reduce5.(it) spread.

The approach differs by age. Primary school classes are being broadcast on one of China’s state TV channels. Junior and senior high school students in China can use an online learning platform 6.has 169 lessons covering 12 subjects for the first week, based on the national curriculum. Teachers will keep 7.(update) the platform with new materials as needed.

The government has enlisted the China's three8.(big) telecoms operators—China Mobile, China Unicom and China Telecom—plus tech companies like Huawei, Baidu and Alibaba to back up the platform with 90 terabytes of bandwidth and 7,000 servers, 9.(ensure) up to 50 million students can use it simultaneously, according to state broadcaster CCTV News. About 600,000 teachers have also been using a live streaming service called Dingtalk, built by Alibaba, to conduct online classes, the company said, although it has10.(apparent) not gone down so well with many students.