He decided a letter to his uncle in New York city.
| A．writes | B．write |
| C．writing | D．to write |
–Do you have some trouble ____ the problem? Do you need some help?
--No, thank you. I can make it myself.
| A．solve | B．solving | C．to solve | D．solved |
My pet dog ____ five months ago. Its ____ made me very sad.
| A．died, die | B．died, death | C．death, dead | D．dead, die |
We can go hiking next week ____ it rains heavily.
| A．unless | B．if | C．though | D．because |
–Look at the woman, why does she look so tired?
--Because she has three babies to ____.
| A．take care | B．be careful | C．take care of | D．be careful of |
There are so many good books. I really don’t know ____ .
| A．to choose which one | B．choose which one |
| C．to which one choose | D．which one to choose |