Well, you’ve come back! ________ did you stay in Shanghai?— For about seven days. I really enjoyed myself.

Mr. Green didn’t understand ________ made his daughter so absent-minded this morning.

Is this the reason __________ at the meeting for his carelessness in his work?[ ]

Gary: I can’t find my pen. Nina: Is the one on Jack’s desk ? Gary: Yes, Thank you.

Where is your mother?— She _______ to Sichuan on business. She has ______ there four times recently.