单项选择题
They didn′t accept my invitation atfirst, but I ______ persuade them at last.
单项选择题 --Sorry, I′m late.--That′s OK. You′re here that′s what ______
单项选择题 属于光受体是（ ）。
单项选择题 Next summer after taking the nationalentrance examination, ______ I′ll stay in Hainan Island, will surely be anexciting holiday.
