It's good feeling for people to admire the Shanghai World Expo that gives them pleasure.（）
| A． | 不填, a | B． | a, 不填 | C． | the, a | D． | a, the |
_______ we start thinking and believing we can do it, anything is possible.
| A．Since | B．While | C．Until | D．Once |
The output of the gold mine is now four times _____ it was before liberation.
| A．that | B．what | C．which | D．than |
Thinking of the days, when he was looked down upon as a poor peasant, _______.
| A．his heart was filled with sorrow | B．tears came down his face |
| C．he was in great sorrow | D．we found him wiping his eyes |
Laws have been passed in parts of South Africa, _____ governments either tax shoppers who use plastic bags or fine companies that hand them out.
| A．which | B．where | C．as | D．what |
A new study has found no evidence that the sunscreen, commonly used to reduce the risk of skin cancer, actually____ the risk.
| A．increase | B．increasing | C．increases | D．having increased |