小题1:Our beautiful classroom ________(clean) every day.

小题2:In order to improve Mary’s self-confidence,her teacher asked her to look at ________(she)in a mirror every morning and say “I’m the best. ”

小题3:She was very ________(happy) to fail the final exam.

小题4:Here are _________(tomato) noodles.They smell good!

小题5:Trust him!He has no difficulty _______(work) out the problem.

小题6:Ceaners clean the street every day.Their work is _________(true) common.

小题7:More and more people all over thd country are worried about food _______(safe).

小题8:Windy does ________(badly) is P.E. than me.

氧化产物中Fe₃O₄、Fe₂O₃和Cu₂O的数量。取决于（）。

A、原料中的Fe和处理的物料量；

B、冰铜品位与原料SiO₂的含量；

C、原料中的Cu和处理的物料量；

D、原料中的Fe和原料中的Cu含量