Once , the rules will work.
We believe scientists will ________a way to solve the problem of air pollution.
Hiswife______hischildrenwasinvitedtotheparty.
—What’s the matter _______Mike? He is wet through. —His car ran _______the river.
Pleaseask________nottoskateonthethinice.It’sverydangerous.
Wouldn’titbe______wonderfulworldifwecouldlivein______peace?