1 . World Environment Day is a UN Environment-led global event,     1     takes place on June 5 every year and is celebrated by thousands of communities worldwide. Since it began in 1972, it has grown to become the     2     (large) of all the celebrations of environment each year. China owns half the world’s electric vehicles and 99% of the world’s electric buses. By     3     (host) World Environment Day 2019, the Chinese government will be able to showcase its innovation and progress toward a cleaner environment.

2 . They overcame some difficulties and completed the work ahead of time, ________ was something we had not expected.

A．that	B．which
C．it	D．what

3 . Tourists love Beijing,        offers an infinite collection of delights ranging from 6 UNESCO World Heritage Sites to food from every corner of China and beyond.

A．that	B．where
C．which	D．who

4 . 【2018·北京】She and her family bicycle to work, _________ helps them keep fit.

A．which	B．who
C．as	D．that

5 . It rained this morning, _____ actually didn’t bother me because I like walking in the rain.

A．what	B．when
C．where	D．which

6 . I keep the picture where I can see it every day,       reminds me of the days in my hometown.

A．that	B．which
C．who	D．when

7 . Yuan Longping has won many awards,        shows his extraordinary achievements.

A．what	B．that
C．who	D．which

8 . Mrs. Wang helped me a lot with my English last term, _______ made me very moved.

A．who	B．where
C．which	D．when

9 . History enables pupils to learn about their culture, ________ helps them to understand the society they live in.

A．who	B．which
C．where	D．that

10 . The fire,        occurred in Xinjian Village, Daxing District, was reported at 6:15 pm, according to the fire department.

A．where	B．which
C．that	D．as