At the beginning of the term, a campaign” to be a good student and a good citizen” was launched in our school, and great changes have taken ________ since then.

Before the campaign, we u_____ to be late for school and failed to hand in our homework in t____.Often, we forgot to greet our teachers and after class we ______(发出)loud noises. Worse still, we jumped the quene when waiting ______ buses. However, the campaigns have changed us a lot. We are no longer late for school and more______(认真)in our homework. We have learned to show______(尊敬)for the elders, help others and give up seats to other passengers.

The campaign is a very good experience, from_____ we have learned a lot. More importantly, we have g___rid of many bad habits becoming better students at school and better citizens in_____（社会）

采用掺加适量混合材料、外加剂，尽可能降低混凝土水灰比等有效措施，以提高混凝土的保水性，从而减少泌水现象。( )