We can complete our tasks well. We should count on John's support

We can complete our tasks well. We should count on John's support.
A.We could complete our tasks well if we supported Jonh.
B.Provided John supported us, we could not complete our tasks well.
C. Unless we have John's support , we can not complete our tasks well.
D. But for John's support, we could not complete our tasks well

The doctors in Vietnam have........contributions to the treatment of COVID -19
A. done

B.made

C.created

D.brought
This is just a temporary ..........to stop the problem from getting worse
A. aim

B. measure

C.development

D. opportunity