It still puzzles today’s scientists ______ some mammals produce their young ______ others lay eggs to produce their offspring( 后代)
| A．that; while | B．why; while | C．how; when | D．what; as |
Eating too much fat can _____ heart disease and cause high blood pressure.
| A．result from | B．contribute to | C．attend to | D．devote to |
_____ we can’t get seems better than _____ we have.
| A．What, what | B．What, that | C．That, that | D．That, what |
Twelve Cubans left the embassy after_____ there for several days.
| A．sheltering | B．sheltered | C．was sheltered | D．had sheltered |
To everyone’s surprise, a lawyer was _____ headmaster of this new school.
| A．named after | B．appointed | C．adopted | D．in the name of |
_____ in the detective story, he didn’t notice his father speaking to him.
| A．Having absorbed | B．Absorbing | C．Being absorbed | D．Absorbed |