#10488 There is heavy ___ on the road during the rush hours.… ★★☆☆☆ #10489 He gave me some good ___ on how to keep healthy.… ★★☆☆☆ #10491 His ___ of English grammar is much better than mine.… ★★☆☆☆ #10492 He visited many places of ___ during the summer holiday.… ★★☆☆☆ #10494 He has rich ___ in teaching beginners how to swim.… ★★☆☆☆