【推荐1】Considering these negative effects low gravity has ________ the human body, we discipline ourselves to do at least two hours of exercise every day. (用适当的词填空)

【推荐2】We all know that playing with the smartphone for a long time has a bad effect ________our eyesight. （用适当的词填空）

【推荐3】What the teacher says and does sometimes has an effect ________ a child. (用适当的词填空)

【推荐1】I’m sure that it will have an effect______our natural environment. (用适当的词填空)

【推荐2】You can’t imagine the effect his speech will have__________ children. （用适当的词填空）

【推荐3】We all know that playing with the smartphone for a long time has a bad effect ________our eyesight. （用适当的词填空）

【推荐1】Studies show that people are more likely to suffer__________ back problems if they always sit before computer screens for long hours. （用适当的词填空）

【推荐2】I consulted our teacher yesterday. He said our holidays must be limited ________ five days. （用适当的词填空）

【推荐3】The newly-built school is intended____________the disabled children.    （用适当的词填空）