Hi I need help in the following sentences that will show proper agreement:

1. A little child often (see, sees) more than you think. see, is this correct?
2. The phenomena associated with a total eclipse of the sun ( was, were) studied by scientists from all over the world. was-- is the proper agreement.

3. The bus with twenty-five children, three men, and two women ( was, were) studied by scientists from all over the world. were-- is the proper agreement

4. The army, supported by airplanes and artillery, ( has, have) won the battle. has --is the proper agreement.

I am right or wrong?