If you cannot have a good command of grammar as well as precise usage of each word you’ve learnt, it is ________ for you to use English flexibly.
________twice a year,whether it is a car or a bus or a truck,is the rule that every driver must obey in this city.
Yesterday a streetbeggar bought a lottery ticket purposelessly,________him a millionaire overnight.
Now that we’ve discussed our problem,are people happy with the decisions ________?
He hurried to the station,only ________ that the train had left.
You should understand the traffic rule by now.You’ve had it ________ often enough.