Plastic bags are provided for our convenience but they also have __________ the pollution of the environment.
----What’s that smell? ---- I don’t know, but ______ it is, it’s terrible!
We thought there were 35 students in the dining hall, ____, in fact, there were 40.
She is very ______ about her ugly appearance, so you shouldn’t stare at her.
I don’t think the experiment is ______ failure. At least we have gained ______ experience for future success.
She is a strong willed woman and not oncein to any difficulty in her life.