按照句子结构的语法性，在下面空格处填入一个适当的词语或使用括号中词语的适当形式填空
小题1:Unless _________ (invite), I won’t attend their wedding.
小题2:We spent an ___________ (enjoy) weekend.
小题3:He noticed all the room ____________ (break) into at the case spot.
小题4:Your graduation paper must ____________ (submit) by 10am.
小题5:She is really a __________ (gift) biochemist.
小题6:Hardly had she arrived home ________ it began to rain heavily.
小题7:At first, she worked as an ____________ (assist) to a famous journalist.
小题8:After the film was over, people went home ___________ all directions.
小题9:If you don't go swimming tonight, __________ will I.
小题10:The child held his mother’s arm _____________ (firm) when he saw her.
小题11:Those books ____________ (buy) on the Internet are usually best-sellers.
小题12:We must be strict ___________ ourselves.
小题13:_____ seemed that the water was to blame.
小题14:I find it difficult ____________ (learn) English well.
小题15:Doctors are trying a new ________ (treat) for cancer.