I will endeavour to do my best for my country.
我將竭盡全力報效祖國。
I will contact you later to advise you when to come.
稍后我會與你聯系，通知你何時前來。
I will send you a copy of the report.
我會把這個報告的復印本寄給你。
I will attempt to answer all your questions.
我將努力回答你的全部問題。
I will contact you by letter.
我會給你寫信聯系的。