Select the correct verb

1. Rice from Thailand and Denmark.......... imported last year. (was/were).

2. You and he.......... a big problem to solve. (has/have).

3. Either your sisters or I.......... going home. (is/are/am) .

4. It is I who........... to blame for negligence. ( are/is/am).

5. Are you the teacher who.......... my son? (likes/like)

Please help me. This is CONCORD( SUBJECT-VERB AGREEMENT)