I think this is the most interesting thing _____ has happened to us .
A．that B．which C．what D．who
--- I’d like to introduce my best friend to you , Peter .
---- Thank you , Lucy . But we __________already .
A．meet B．met C．will meet D．have met
_____ out your love . The world will become a nicer place to live in .
A．Speak B．To speak C．Speaking D．Spoke
Success will belong to those ___ never say impossible ..
A．whom B．who C．that D．which
----- Have you heard of Earth Day ?
----Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
A．celebrates B．celebrated C．is celebrated D．was celebrated
--- How was ___ dinner at Mary’s house ?
--- Great . Her dad is ____ wonderful chef.
A．a, the B．the , a C．the ,the D．a ,an
