It______last week that the haze(雾霾)in BeiJing caused many problems.A. was reportedB. is reportedC. reported
_______ is the baseball? ---- It’s under the chair.
There is ____ “f” in the worD.“first”. A.an B.A. C.the D./
Look! Those _______ my sisters.
Is this your pencil?----- ___________.
----________ you Li Xiaoming? ----Yes, I ________.