Lizzie was______ to see her friend off at the airport.

I’m certain David’s told you his business trouble. ________, it’s no secret that he owes a lot of money to the bank..

When it comes to a foreign language, he is not ________ quick a learner as his brother.

 Nature reserves are very important for preserving many animals and plants, which would _______ run the risk of becoming extinct.

I always_____follow the instructions of my doctor when taking medicine.