The way you thought of _______ the experiment is very practical.
| A．carrying out | B．which to carry out |
| C．that carries out | D．to carry out |
I’m sorry I can’t go to the film with you because I have a lot of things to _________.
| A．take to | B．get to |
| C．see to | D．keep to |
Children’s brains can’t develop properly_______ they lack protein(蛋白质).
| A．when | B．since | C．because | D．unless |
This is the very toy car ________ which he came here the other day.
| A．by | B．in | C．for | D．on |
I began to fish before memory began, _______ I know I have always fished.
| A．so far | B．so as far as | C．as far as | D．so |
______ I had done it I knew I had made a mistake.
| A．Hardly | B．Directly | C．Mostly | D．Nearly |