Scientists have to work hard to keep ________ with modern discoveries and developments.
_________ the extremely hot weather, we continued having classes.
Rose _________ tell her mother that she didn’t pass the exam.
Tom has been absent for two days.Do you know what _________ to him?
--Which of the two films do you prefer? -- To tell you the truth,, I don’t like _________.
_________ it rain, the crops would be saved.