People have always been curious how living things on the earth exactly began.
| A．in | B．at | C．of | D．about |
.I fell down and broke three of my teeth. I wonder how many times I have to come here and get my false teeth _______.
| A．fix | B．fixing | C．fixed | D．to fix |
_______ the house on fire, he dialed 119.
| A．To see | B．Seeing | C．Having seen | D．Being seen |
The sentence needs _______.
| A．improve | B．a improvement | C．improving | D．improved |
It's no use _______ so much money on clothes.
| A．spend | B．spent | C．spending | D．being spent |
. _______ his mother, the baby could not help _______.
| A．To see ；to laugh | B．Seeing ； to laugh | C．Seeing ；laughing | D．To see ；laughing |