We all think we are tired after the long work. Let，s stop a rest.
| A．have | B．to have | C．having | D．to having |
The boy isn’t old enough ________ with the difficult problem by himself.
| A．deal | B．deals | C．dealing | D．to deal |
Not only Susan but also Sandy _________ abroad for traveling. They will return next Sunday.
| A．has gone | B．have gone to | C．have been | D．has been to |
— _________ has Liu Xiang taken part in world’s competitions of 110-metre hurdles?
— I’ve no idea. Let’s find it out on the Internet.
| A．How often | B．How many times | C．How much time | D．How much |
After the earthquake, many kind-hearted people did what they could ________ those who suffered from it.
| A．help | B．helping | C．to help | D．helped |
Japan and other countries have taken action ________ prevent nuclear radiation (核辐射).
| A．in order | B．in the order of | C．in order to | D．in order that |