下列词语中加点字的读音全都正确的一项是

The country has already sent up 3 unmanned spacecraft, the most recent at the end of last March.

John wants to be a, so he often helps sick people in the hospital.

______ will you be able to reach the top of the hill — In ten minutes.

It shouldn’t take long to clear up after the get-together if we all volunteer to help.—I agree. ________.