I told Mom that not everyone could manage to have 3 meals on time everyday, ________?
I’m afraid none of us can __________ the machine that has been imported from abroad.Which of the following is wrong?
In Britain,sales of cigarettes have been reduced __________ 30% in the past ten years.
Whenever you are to walk on the ice,__________ that it is solid and safe enough.
It is a __________ that you missed such a wonderful concert.
Because of the snow,many parts of the countryside are only _________ by helicopter.