Scientists are convinced the positive effect of laughter physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on;at |
You were silly ___________ your car, otherwise it wouldn’t have been stolen.
| A．not locking | B．to not lock |
| C．not having locked | D．not to have locked |
－Shall we have our house painted?
－________ I think it’s fine as it is.
| A．Why not? | B．Why bother? |
| C．Not exactly. | D．How come? |
There was a time I couldn’t fall asleep almost the whole night.
| A．which | B．when |
| C．how | D．where |
The difference in thickness and weight from earlier version makes the iPad 2 more
comfortable________
| A．held | B．holding |
| C．be held | D．to hold |
The flowers _______ sweet in the garden attract the visitors to the beauty of nature.
| A．smelling | B．to smell |
| C．smelt | D．smells |