________evidence that language acquiring ability must be stimulated.
A、IfbeingC
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Onhearingagreatnoise,Mikelookedforwardthroughthewindow_____whathappenedoutsidetheroom.
I heard that you really had a wonderful time at John's birthday party, _____?
Duringthetouristseason,therearemanypeoplewanderinginthiscitytoseetheoldcastles_____inthesixteenthcentury.
In recent years much more emphasis has been put______ developing the students productive skills.
There are some police cars in front. What do you suppose _____?
