用first/at first/firstly/first of all填空
① I found English difficult.
②You must finish your work .
③It was very hot ，but then it got cooler.
④When I met you，I thought you were a fine man.
⑤Let's see who gets there .
⑥“Are you interested in Chinese？”“Yes，but I wasn't .”
⑦ brush your teeth，secondly (second) wash your face.
⑧ ，you must answer my question.
【答案】 ①At first ②first ③at first ④first ⑤first ⑥at first ⑦Firstly/First ⑧First of all
