1. Hung's brother doesn't drive so carefully as Hung does

2. Some years ago the laboratory was eqquied worse than it is now

3. Quang works harder than Nam, so he often gets better marks than Nam

4. Minh drives (không phải "drivers) less carefully than Trang.

5. Going by a bus is slower than going by a taxi but it costs less than a taxi

1. Hung's brother drives less carefully than he ( does ) 

   hoặc: Hung's brother doesn't drive as carefully as he (does)

2. Some years ago the laboratory in my school is more badly equipped than now.

3. Quang works harder than Nam so he often gets good marks.

4. Minh drives more carelessly than Trung so he often ( always/ usually/... ) had an accident. 

5. Going by bus is slower than going by taxi but it costs not as little as a bus.