. There is such an occasion ___________ we know lots of words, but we can’t choose a suitable one to express ourselves.
| A．where | B．when | C．which | D．what |
It is important that we wild animals.
| A. will protect |
B. should protect |
C. shall protect |
D. are protecting |
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 |