It is uncertainside effect the medicine will bring about, although about two thousand patients have taken it.
25. --- We could have walked to the station. It was so near.--- Yes. A taxi ____ at all necessary.
24. The valley was _____ in sunlight, and the children were singing and jumping with joy
23. Everyone should remember it is very important to _____ the balance of nature toady.
22. She always ____ her opinion ____ facts.
21. Every morning, the fish mongers stood there ______ with the fishermen for fishes.