Sorry, Doctor Smith isn’t here right now. —May I ____ a message on his desk?

Where are you going ______ the holiday?[ ]

Our school had tothe soccer games because of the bad weather, which made students frustrated.

.One advantage of eating a balanced breakfast is _____ it can keep you energetic throughout the day.

Mike, why did you make no reply to me when I called your name in the street just now?-Sorry, Tom. I_______ to my mother on the phone.