________ the students were talking and laughing, the teacher came into the classroom．

A．While

B．Until

C．Because

D．If

He usually has breakfast at home ________ Sundays．

A．in

B．on

C．at

D．of

I think there will be ________ trees in the future if we often cut down the trees to make houses．

A．less

B．more

C．fewer

D．many

He said： “Mary, I will call you later．” He told Mary he would call ________ later．

A．him

B．her

C．me

D．you

The boy checked his test paper ________ in order to get full marks．

A．enough careful

B．enough carefully

C．careful enough

D．carefully enough

Father doesn't tell me when he ________．I'll call you as soon as he ________．

A．will come; comes

B．will come; will come

C．comes; will come

D．comes; comes

The words that we should pay attention to ________ on the blackboard．

A．being written

B．are written

C．is writing

D．be written

There were about six ________ students in the school building during the earthquake, and ________ of them didn't run out．

A．hundred; two third

B．hundred; two thirds

C．hundreds; two thirds

D．hundreds; two third

This is the factory ________ my father works．

A．which

B．who

C．in which

D．that

They planted trees on ________ side of the road．

A．both

B．each

C．all

D．every