用所给词的适当形式填空
（1）Can those students________（have）lunch at home？
（2）Look at the sign（标志）on the wall！It says“No________（talk）！”
（3）________（do）your homework and don’t watch TV．
（4）It’s too cold outside．Please keep the windows________（close）．
（5）________（not be）late next time．