We must try our （our/ours） best to protect plants．They're important to human beings．
﹣﹣﹣ Have you seen the film The Wandering Earth（流浪地球）？
﹣﹣﹣Yes．It's the best one I have ever seen．（ ）
A．thatB．whichC．whatD．it
Businessmen prefer e﹣mails to communicate with each other rather than phone calls．（ ）
A．write， makeB．to write， make
C．to write， to makeD．write ，to make
I saw her flowers in the garden when I passed by．
A．to waterB．waterC．wateringD．watered
﹣﹣﹣I don' t know if Sam_____．
﹣﹣﹣Don't worry．I will tell you as soon as he_____．（ ）
A．will come， comesB．comes， will come
C．will come， will comeD．comes， comes
The teacher asked Li Hua ．（ ）
A．why is he late for class
B．why he is late for class
C．why was he late for class
D．why he was late for class