___ crying sadly, he raised his head and let tears stream down his face on purpose.[ ]

33We were to go out for a walk ________ it began to rain

A good teacher should leave some time for the students to __________ the knowledge.

How can I apply for an online course? —Just fill out this form and we______ what we can do for you

Obama delivered a speech to 500 local youths during his visit to China, many of _______ were from Fudan University and Tongji University.