________ is known to all is that effective measures should be taken to deal with the problem of the overexploitation of our resources.
arents encourage their children totake an active part in social events, ______ those events do not interfere withtheir studies.
Everyone must __________ the security check (安检) before getting on the plane at the airport.— Yes. It’s necessary to ensure the passengers’ safety.
re model teachers, most of_________ are young women
______ patient when you argue with someone who is not so reasonable.
