Which of the following can NOT be used as subject?
I’m not sure if Mr. Zhang _____ . If he ______,please let me know .
Mary can not only speak Japanese but also ______ .
---Please _________ us in the party. ---I’d love to, but I’m afraid I’m too busy at the moment.
---The boss asked me to remind you of the meeting this afternoon. Don’t forget it! ---OK, I _________.
The teacher went up to ask _________.