4747 .Mr. Buong spends 30 minutes driving to work everyday 

⇒⇒ S+spend+time/money+V-ing: dành thời gian/tiền làm điều gì đó

4848 .He fond of surfing the facebook in his leisure time

⇒⇒ fond of+V-ing: mê làm điều gì đó

⇒⇒ surfing the favebook: lướt facebook

4949 .Ms Lan isn't keen on going out at night 

⇒⇒ keen on+V-ing:  ham mê làm điều gì đó

⇒⇒ going out: ra ngoài

5050 .Are you interested in making dollhouses in your leisure time

⇒⇒ interested in+V-ing: thích làm điều gì đo

⇒⇒ make dollhouses: làm nhà búp bê

You've got it all correct! Here's the breakdown:

• 47. It takes Mr Buong 30 minutes to drive to work everyday. → Mr Buong spends 30 minutes driving to work every day. - 
• **48. He loves surfing the facebook in his leisure time. FOND > He ** - You've identified the correct word "fond" to replace "loves". 
• 49. Ms Lan hates going out at night. → Ms Lan isn't keen on going out at night. 
• 50. Do you like making dollhouses in your leisure time? → Are you interested in making dollhouses in yourleisure time?