--Mary, have you got my email? I sent you a birthday card yesterday. ---Oh, really! I haven't ___my mailbox yet.
See the flags on the top of the building? That was _______ we did this morning.
I’ll take ________ wants to go.
You didn’t bother me.________ ,I like your company.
—— I’m sorry the traffic is so heavy. —— Does that _____ why you are so late?
Being a disabled man, he has difficulty ________________