—Is Jack on duty today?
—It __________ be him. It’s his turn tomorrow.
| A．mustn’t | B．won’t |
| C．can’t | D．needn’t |
________, I could not memorize the text.
| A．However hard did I try | B．However hard I tried |
| C．However I tried hard | D．However I had tried hard |
Raising environmental awareness was the aim of our art exhibition ____ last week.
| A．to hold | B．held | C．having held | D．being held |
_________ he was, he still went on with his work.
| A．Tired although | B．Tiring as | C．Tired though | D．While tired |
It was the training ________ he had as a young man ________ made him so excellent.
| A．what; that | B．that; which | C．that; what | D．which; that |
Not until she took off her dark glasses ________ she was a famous film star.
| A．I realised | B．that did I realise | C．did I realise | D．that I realised |