21. I go to work by_____car and I usually drive at______speed of 50 kilometers an hour.
A a; \ B a;a C\;a D \; \
22. How excited we are! The National Day holiday we have been looking forward to ______soon.
A. coming B. come C. came D. is coming
23. It doesn’t often rain in the summer here, and _____we have to water the vegetable garden.
A. as a result B. in other words C. in fact D. as well