When an earthquake happens，I think the most important safety _____ is to keep calm（ ）
A．ruleB．doubtC．conditionD．problem
In China， many students feel stressed because of too much homework．
Don′t worry．Our government has realized this problem， I′m sure there be good news for them soon．（ ）
A．canB．mustC．shouldD．need
Sandy seldom goes out at weekends because reading most of her free time．（ ）
A．takes upB．takes onC．takes offD．takes out
Father is too tired today．Don't call him it is necessary．（ ）
A．ifB．unlessC．whenD．whether
I will volunteer for a two﹣day home stay for an exchange student from the UK．I consider it a good chance to show Chinese food our kindness．（ ）
A．as well asB．so well asC．as good asD．so good as
Some primary and secondary schools winter sports to their courses since Beijing won the right to host the 2022 Winter Olympic Games．（ ）
A．addedB．will add
C．have addedD．were adding