Professor Wu is a teacher respected by all of us, who always ________ new teaching methods toimprove our English.[ ]

What do you think of the bottled water? –I don’t like it at allIt is reported that much nutrition, including some minerals, _____ while it is being processed

The new trend of living a low carbon life is gradually changing people’s idea on ______is cool and in fashion.

Sometimes I work __the daysometimes__night.

My sister helped me _________ English last weekend.