.After hours of repair, the driver tried to start the machine but it ________work.
the sentence , so he asked the teacher to explain it again.
——The weather is too cold ____ March this year. ——It was still ____ when I came here years ago.
The “Warning” reads: “Under no circumstances _____ be kept near fire!”
Had the boy worked harder, he ______ the exam.
________ is surprising to us is that Tom, for _______ English was once boring, can speak English fluently as though he were a native speaker.