CO2 is __________ one carbon atom（碳原子）and two oxygen（氧）atoms.
A.made from B.made of C.made up of
—Has the teacher told you __________?
—In a few days.
A.when will he be back B.when he will be back C.when he would be back
Is this school __________ you visited last week?
A.which B.where C.the one
I will __________ the newspaper to see what happened yesterday.
A.look through B.look up C.look down
__________ shouting, please! It's against the rules.
A.Don't B.Not C.No
Cheng Chenyu can look after himself, __________ it won't be easy for him.
A.but B.although C.so
