21. ---It looks heavy. Can I give you a hand?
---_______.
| A．No, thanks | B．Yes, my pleasure | C．No, never mind | D．Yes, I do |
She had a computer at home, and her parents desired that she ______ all her work at home.
| A．do | B．does | C．did | D．doing |
Tom was very angry about ________ to Mary’s birthday party.
| A．not inviting | B．being not invited | C．not being invited | D．not to be invited |
I lost my way in complete darkness and, ______ matters worse, it began to rain.
| A．made | B．making | C．to make | D．having made |
I’d rather you ________ there next week.
| A．went | B．go | C．should go | D．had gone |
I won’t give in ________ great difficulties I come across in my life.
| A．however | B．whatever | C．whichever | D．wherever |