429.I think it is necessary for my 19-year-old son to have his own mobile phone,for I sometimes want to make sure if he ____ home for dinner.
A.come
B.comes
C.has come
D.will come
430.Ladies and gentlemen, please fasten your seat belts. The plane _____.
A.takes off
B.is taking off
C.has taken off
D.took off
429.答案是D;根据句意，应用will come表将来和意愿。
430.答案是B;动词go，come, leave及词组take off等用现在进行时表示将要发生的动作。
