Please do not call me at 8 p.m. because I _______to Beijing.
He asked whether we were ________ women taking part in political activities.
—How about your travel? —You can hardly imagine what difficulty we have had ___________ the vast desert.
Hissisterlefthomein1998,and_________since then.
Thepoliceman’s_________trafficdirectionsmadeallthedriversquite ___________.
The president is talking on ____ phone with astronauts in ____ space.