﹣Could I ride an electric bicycle to school，Mr．Wang？
﹣No，you _____．Students under the age of 16 aren't allowed to ride electric bicycles．（ ）
A．couldn'tB．needn'tC．can't
These activities at bedtime can get kids excited and make it hard for them to____ and sleep．（ ）
A．come downB．break downC．calm downD．sit down
What our society is like is decided by____ everyone chooses to behave．（ ）
A．whereB．whenC．howD．why
The Birdwatching Society goes to Zhalong Nature Reserve___ the birds every year．（ ）
A．to countB．countingC．countD．counts
Although Zhong Nanshan knows the new virus is more____ to old people， he cares little for his own safety．（ ）
A．politeB．dangerousC．friendlyD．important
It is said that Yancheng﹣Nantong High﹣speed Railway _______ in December， 2020．（ ）
A．completeB．is completed
C．was completedD．will be completed