Generally speaking, _____ according to the derections , the drug has no side effect.
| A．when to take | B．when taking | C．when to be taken | D．when taken |
After watchingTV, she playedviolin for an hour.
| A．不填；不填 | B．the； the | C．the；不填 | D．不填； the |
The two presidents agree with each other on the whole , but much remains at the following meeting .
| A．discussing | B．discussed | C．to discuss | D．to be discussed |
—Be careful not to drop the Tang Dynasty vase .
—Yes , we can’t be .
| A．too careful | B．very careful | C．too careless | D．careless enough |
If you are not yet , you are forbidden to visit this site .
| A．eighteen years | B．at age of eighteen |
| C．eighteen – year-old | D．eighteen years of age |
We must prepare ourselves for the worst we are at a loss when meeting with difficulties .
| A．after | B．before | C．as | D．since |