______ once every two years, whether it is a car, a bus or a lorry, is the rule that all drivers must obey in our country.
---It is known to all that this factory pours lots of waste water into the Changjiang River every year. ---- _________ near my hometown.
He didn’t attend the meeting last night, _________ he doesn’t know our plan for the picnic.
In 1778, Banks was elected ________president of the Royal Society, ________position he held for 42 years.
--- What time are you planning to _____ tomorrow? ---It’s up to you.
The whole family were sound asleep when the disaster_____.