.Jane has lost weight by going on diet and taking exercise every day.
| A．a, an | B．/, / | C．a, / | D．/, an |
We must soon ______a new teacher to the class.
| A．adapt | B．appoint | C．exchange | D．abuse |
The tourists, had enjoyed themselves so much in the botanic garden, were worn out
| A．all of what | B．all of which | C．all of them | D．all of whom |
We can hardly believe such a young boy ______ travel around the world all by himself.
| A．may | B．need | C．should | D．must |
My friend Jack was the first person I knew ______an iPhone 5S.
| A．using | B．to use | C．used | D．having used |
They hope to turn our society into one ______ those in need can get help.
| A．where | B．which | C．when | D．who |