（1）Look at those black clouds. There ________（be）a storm.
（2）—Did you tell Julia about the result？
—Oh，no，I forgot. I ________（call）her right now.
（3）My wife and I ________（leave）for London next week.
（4）The plane ________（leave）at 8 pm，so I have to be at the airport by 7：00 at the latest.