——_________ should your robot need_________ batteries?
——Every two months.
| A．How soon, to be changed | B．How long, to change |
| C．How much, change | D．How often, to change |
Why not________to Beijing for vacation?
A．consider going
B．considering going
C．consider to do
My younger brother failed________the exam even though he studied so hard．
| A．passed |
| B．pass |
| C．to pass |
| D．passing |
The man is thirsty________money and power．His wife wants him to pay attention to health and family．
| A．with |
| B．at |
| C．of |
| D．for |
My dog is very________．It is safe to touch him if you want to．
| A．smart |
| B．brave |
| C．happy |
| D．friendly |
The baby elephant is from Africa．She________．
| A．eat grass |
| B．eats grass |
| C．eat grasses |
| D．eats grasses |