--- It’s the fourth time that heavy smog(雾霾) has hit the city this month. --- It’s high time we _______ measures to fight air pollution.
There is no doubt _______he will come tomorrow, but I do doubt _____he will come on time.
Catherine II had the Amber Room _________ to a palace outside St Petersberg where she spent her summers.
A great person is someone who ___________others.
I have to_______ my dictionary because there are too many new words.
I _________ have watched that movie--it’ll give me horrible dreams.