I hear Sam has gone to Qingdao for his holiday.— Oh, how nice! Do you know when he________

The demand that the law on gun ownership _____ be changed ___ is very strong.

He came all the way to China for promoting friendship for making money.

Is this the hotel _____ you said we were to stay in your letter?

22.Some people are worrying about the possibility ________ cellphones could be responsible for a range of illnesses, from rashes to brain tumors