—Who has taken my pen away?
—__________. He was here a moment ago.
| A．It must be Li Ping | B．It is Li Ping take |
| C．Li Ping is | D．Li Ping must take |
The good thing about children is that they __________ very easily to the new environment.
| A．adapt |
| B．appeal |
| C．attach |
| D．apply |
In my opinion, to eat more vegetables and play some sports is __________ to our health.
| A．personal |
| B．natural |
| C．beneficial |
| D．informal |
—Will Thursday or Friday __________ you?
—Either will __________
| A．fit； be |
| B．fit； OK |
| C．suit； all right |
| D．suit； do |
Experiments of this kind __________ in both the U. S. and Europe well before the Second World War.
| A．have conducted |
| B．have been conducted |
| C．had conducted |
| D．had been conducted |
It's no use __________ without taking action.
| A．complain |
| B．complaining |
| C．being complained |
| D．to be complained |