He is reading a book about ________（现代的）history.
中国将不会拒绝任何一个真心加入亚投行的国家．
China won't any country that really wants to join Asian Infrastructure Investment Bank．
Now， the robotic fish， researchers may be able to keep a close eye on fish and discover undersea secrets．（由于，多亏）
Many people nowadays are talking about ， but I know little about it． （黑洞）
On weekdays，we must school before 7：30 in the morning．（到达）
The students often ask Mr Li for some advice on improving ．（英语口语）