— Haven’t seen you for ages! Where have you been?— I____ in Xinjiang for one year, volunteering services as a doctor.
If we _______ adequate preparations, the conference wouldn’t have been so successful.
I can hardly imagine Peter ________ across the Atlantic Ocean in five days.
I can’t quite remember ________ I was taken to Beijing.
With more forests being destroyed,huge quantities of good earth ________ each year.
One of our rules is that every student wear school uniform while at school.