According to the rules and regulations, all payments ________ be made in cash in the shopping center.
| A．shall | B．can |
| C．must | D．should |
Don’t talk such things ___ you don't understand.
| A．that | B．which | C．what | D．as |
This is the same bicycle ___ I lost.
| A．as | B．that | C．which | D．A and B |
There are no children ___ love their parents.
| A．that do not | B．who does not | C．that | D．who |
Children should not have more money ___ needed.
| A．which | B．that | C．than | D．as |
---Mary hasn't written to us for a long time.---What do you suppose __ to her?
| A．happened | B．to happen | C．was happened | D．having happened |