Let's take a walk ___________ the river after diner， shall we？（ ）
A．alongB．throughC．uponD．over
Amy hid under _______ desk in a hurry when the earthquake happened.（ ）
A．sheB．herC．hersD．herself
﹣﹣﹣Millie，______ are you reading？
﹣﹣﹣Camel Xiangzi，by the famous Chinese writer，Lao She.（ ）
A．whoB．howC．whereD．what
We are going to celebrate the 100th anniversary of the founding of the Communist Party of China _________ July 1st，2021.（ ）
A．inB．onC．atD．of
—Tom，turn off the tap.Don't leave it running.
— .（ ）
A．Better notB．Sorry，I will
C．Not at allD．You' re welcome
Keep on dancing，and you'll be better at it. .（ ）
A．Practice makes perfect
B．Burn the candle at both ends
C．It never rains but it pours
D．A friend in need is a friend indeed