The boy wanted to ride his bicycle in the street, but his mother told him ______.
| A．not to | B．not to do | C．not do it | D．do not to |
Though it is 30 years ____ we last met, I still remember the scene _____ we got separated on a rainy day．
| A．before; where | B．since; where |
| C．before; which | D．since; when |
The fellow left without a word as if ________．
| A．never to return | B．never returning |
| C．he had never returned | D．he would never be returning |
His sacrifices for the country were never officially _____, which made all of us feel discouraged．
| A．acknowledged | B．appealed | C．associated | D．approved |
What a pity! I missed meeting my friend at the airport because my car was _____ in the traffic jam．
| A．broken up | B．held up | C．kept back | D．kept up |
--- I'd have made a phone call to you, ___________ your telephone number．
--- That’s all right．What was up then?
| A．if I know | B．had I forgotten |
| C．if I hadn’t remembered | D．but I forgot |