He is busy , he still does sports every day.
A. Although , /
B. Although , but
C. But, /
There used a tree in front of the house, but now it is cut down.
| A．be | B．have |
| C．to be | D．to have |
I the camera for a week already.
| A．bought | B．have bought | C．buy | D．have kept |
You have never visited the place before, you?
| A．did | B．didn’t |
| C．have | D．haven’t |
–Where are the children? – Theyto Beijing.
| A．have been | B．have gone |
| C．have left | D．have arrived |
I enjoy learning English, it takes me a lot of time.
| A．as if | B．though |
| C．because | D．for |