Yu Gong kept moving the mountains，______ he was very old．（ ）
A．soB．althoughC．but
Which of the following signs means that you can go out here？（ ）
A．B．
C．D．
We talked about _____ new words．（ ）
A．learnB．learnedC．learningD．to learn
﹣I left my pen at home．Can you lend me one？（ ）
A．Yes，of courseB．Thank you
C．Yes，just a littleD．Hold on，please
It old the teacher _____ I had seen．（ ）
A．whatB．whichC．whereD．that
﹣Excuse me，is this the right way to the Children's Palace？
﹣Sorry，I'm not sure．But it _____ be．（ ）
A．mustn'tB．mightC．can'tD．must
B．
D．
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