There is not much difference between the two watches. I don’t know ______. Do you have any suggestions —I don’t know , _____.

Smile when ______ the phone. The caller will hear it in your voice.

14How can you cross the river _________ by swimming

n in a hurry, ____How canit be satisfactory

You needn’t call Tom. I ______ ten minutes ago and he ______ the invitation.