Though they had a meeting yesterday, there is still much that remains______.
Scientists say it may be five or six years_______it is possible to test this medicine on human patients.
You have to ____smoking. It isn’t good for your health.
---Must he remember everything he has learned in the class?---No, he _____.
---“Don’t read in bed.”--- What did he said?---He told us _____read in bed.
American English is more or less different____British English______pronunciation and spelling.