---My God! When did you get the door ________?
---Last week．
A．to paint B．painted C．painting D．to be painted
I do every single bit of housework ______ my husband Bob just does the dishes now and then．
A．since B．while C．when D．as
The Great Wall, _____ to be the longest wall in the world, runs across China like a huge dragon．
A．saying B．to say C．said D．being said
It is widely believed among bioengineers _____ it will be possible to create life under laboratory conditions．
A．which B．what C．that D．when
Teaching ___ child to cook will improve many of ___ skills that he or she will need later in life．
A．/; the B．a; the C．a ; / D．the; a
—Rather than ___ on a crowded bus, he always prefers ___ a bicycle.
A. ride; to ride B. riding; ride C. ride; ride D. to ride; Riding
