____the piane will arrive on schedule remains unknown. A.if

____the piane will arrive on schedule remains unknown. A.if （ ）the plane will arrive on schedule remains unknown A、If B、 the plan will arrive on schedule remains unkonwn Whether we will go for an outing tomorrow remains unknown. it remains to be seen ____the new invention will do us a lot I_________whether the project will finish on schedule.选项:a、d When the president will carry out the plan remains unknown t When will your parents ____ on Open Day?A.arrive B.arrive at schedule on I wonder if we will arrive at the meeting on time.I'm afraid If you run fast,you will arrive at school on time同意句 i am worried about if we will arrive there on time改错