I can think of many cases students obviously knew a lot of English words and expressions but couldn' t write a good essay.
If nature doesn’t provide man with the necessary material, it is the laboratory _____ he will turn to for help.
Recently, to expand employment, the Chinese government has ______ a policy of encouraging college graduates to take positions in rural areas.
The new tax policy only affects people on yearly incomes over $120,000, __________, the very rich.
the morning train, he would not have been late for the meeting.
If we a table earlier, we couldn’t be standing here in a queue.