________they visited the Science Museum，they showed great interest in everything they saw.
| A．The first time | B．For the first time |
| C．At first | D．At the first time |
If nature doesn’t provide man with the necessary material, it is the laboratory _____ he will turn to for help.
| A．where | B．that | C．which | D．what |
Recently, to expand employment, the Chinese government has ______ a policy of encouraging college graduates to take positions in rural areas.
| A．adopted | B．admired |
| C．adapted | D．admitted |
The new tax policy only affects people on yearly incomes over $120,000, __________, the very rich.
| A．by the way | B．as a result |
| C．in other words | D．as a manner of |
the morning train, he would not have been late for the meeting.
| A．Did he catch | B．Should he catch |
| C．Has he caught | D．Had he caught |
If we a table earlier, we couldn’t be standing here in a queue.
| A．have booked | B．booked | C．book | D．had booked |