A harmonious society is very important , so all the laws must be strictly _________.
| A．watched | B．observed |
| C．carried | D．handled |
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．though |
My grandfather is always thinking for others. In another word, he is always ________.
| A．modest | B．cautious | C．considerate | D．considerable |
Driving on the road, drivers do ______ the traffic rules, which is responsible for themselves
as well as others.
| A．see | B．watch | C．observe | D．notice |
—Won’t you go to the football tonight?
—________.I might stay at home watching it live on TV instead.
| A．I’d rather not | B．I’m not sure | C．I guess so | D．I’d love to |
—Please let me know where David is. I couldn’t find him anywhere.
—Well, he _____have gone far—his coat’s still here.
| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |