-ing form

Start by ... the acid to the water.

• add

• adding

• ading

• adin

Complete the sentence with the right form of the verb "swim": I'm good at ... .

The scientist insists on ... the experiment.

• conduct

• conducting

• make

• making

Complete the following sentence with the right form of the verb "study": Creating memory rules is good for ... the Periodic Table.

Complete the following sentence with the right form of the verb "be": "He was the main scientist in the project before ... fired."

Complete the following sentence with the write form of the verb "run": "They started ... as fast as possible to save their lives."

Complete the following sentence with the -ing form of the verb "rain": "We went outside when it stopped ... "

Complete the following sentence with the -ing form of the verb "refer": "Start the experiment by ... to the MSDS for this substance."

Complete the following sentence with the -ing form of the verb "obtain": "I'm looking forward to ... good results from this experiment."

Complete the following sentence with the -ing form of the verb "cut": "The poor boy ended up cutting his own finger."