Please let us know what（）are involved and the time（）for delivery.
举一反三
- any change in the date of delivery, please let us know in advance.
- Don’t worry. Please let us know the time and the direction of the train you were on.
- Please let us know if we may be ________ further assistance.
- If you choose not receive those emails, please let us know by (send) ____ us a message.
- __________ you are able to come, please let us know your arrival time.