_______you need any help, please don't hesitate to let me know.
| A．In case | B．Now that |
| C．Even if | D．Ever since |
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 |
Kate didn’t come yesterday, or you ________ her.
| A．would see | B．were to see | C．had seen | D．might have seen |
I walked in our garden, ________Tom and Jim were tying a big sign onto one of the trees.
| A．which | B．when | C．where | D．that |