根据汉语提示完成句子.1．我上学期学习数学有困难. I had math last ter

根据汉语提示完成句子。
1．我上学期学习数学有困难.
      I had___     ___     math last term.
2．他不知道怎样使发音正确.
      He doesn't know how to get the___     ___     ．
3．练习对话一定会帮助你提高口语能力.
      Practicing conversations must____  your ___     ___     .
4．他们发现大声朗读很有用.
      They find ____   very useful ___     ___     ___     ．
5．他不害怕面临挑战.
      He is not ___     ___     ___     the challenge.