High school students continue to work hard, _______ they often complain about great burdens and pressures in their life

is your English teacher—Mrs. Wu .

Where was your dad at this time last night—He was talking with my uncle I was looking for some information on the Internet.

Look at Helen in the room.She is still working so late. 一 It _____be Helen there. She has flown to London with her parents this morning. [ ]

ow about the food I ordered I__________ for 20 minutes— Sorry, sir I will be back with yourorder in a minute