I hate travelling by air_______ you usually have to wait for hours before the plane takes off.
| A．because | B．though | C．until | D．Unless |
The Olympic Games of 2016 will ________ in Brazil.
| A．hold | B．happen | C．take place | D．host |
Millie is too young to ________ herself.
| A．not look after | B．looks after |
| C．looking after | D．look after |
It’s more than 8 years since I a teacher.
| A．become | B．have become |
| C．became | D．becomes |
Tom will be old enough ________ to school this year.
| A．to go | B．going | C．goes | D．go |
– Where is your mother? -- She ________ to shanghai. She has ever ________ there twice.
| A．has gone; gone | B．has been; been |
| C．has gone; been | D．has been; gone |