문제 풀다가 모르겠는게 있어서요.. 해설지가 없어서 ㅠㅠ 왜 이게 답이고 아닌건 왜 아닌지 이유를 알려주실 수 있나요?ㅠ

1.

A: Did you ask the researchers when they can meet for a workshop

B: I sent out an email, but only about half of them (      ) so far.

(a) respond

(b) responds

(c) has responded

(d) have responded

2. As a parent, it is gratifying to have children you can watch (      ) up to become successful adults.

(a) grow

(b) grown

(c) to grow

(d) being grown

3. By the time their teacher (      ) grading their first essays, the students will be nearly finished with their second one.

(a) finishes

(b) will finish

(c) will have finished

4. Port Berry residents (     ) to flee their homes by Hurricane Vera were permitted to return Sunday to assess the damage.

(a) forced 

(d) being forced

5. Finding it difficult to get a job after dropping out of high school, Jerry wished that he (      ) in school to receive his diploma.

(a) will stay

(b) has stayed

(c) had stayed

(d) would stay

6. When questioned, Paula confessed to (        ) sensitive information about the firm's clients.

(a) reveal

(b) revealing

(c) be revealing

(d) have revealed

알려주시면 너무너무 감사하겠습니다ㅠㅠㅠㅠ 물어볼데가 없어요ㅠㅠ..